US20030232644A1

US20030232644A1 - Gaming machine and method of controlling the same

Info

Publication number: US20030232644A1
Application number: US10/401,151
Authority: US
Inventors: Katsumi Takahashi; Takayuki Suzuki; Satoshi Suda
Original assignee: Konami Corp
Current assignee: Konami Group Corp
Priority date: 2002-06-13
Filing date: 2003-03-28
Publication date: 2003-12-18
Also published as: JP2004016315A; AU2006201546A1; AU2003203462B2; AU2006201535A1; AU2003203462A1; JP3753425B2

Abstract

A random number selector selects at least one random number. A display displays at least one of plural symbols in accordance with the selected random number, the plural symbols including at least one first symbol which is associated with a second symbol in a one-to-one correspondence. A replacement controller replaces the first symbol with the second symbol when a predetermined requirement is satisfied under a condition that the first symbol is displayed in the display.

Description

BACKGROUND OF THE INVENTION

The invention relates to a gaming machine which displays temporary symbols and changes the thus-displayed temporary symbols into substantial symbols associated therewith when a predetermined requirement is satisfied, as well as a method of controlling the gaming machine.

For example, U.S. Pat. No. 5,152,529 describes a gaming machine equipped with inner reels and outer reels. In this gaming machine, when “BLANK” is stationarily displayed on the outer reel, the inner reel is further spun, to thereby stationarily display a specific symbol through the blank. Specifically, the gaming machine performs two independent lottery operations; that is, lottery operation for the outer reel and lottery operation for the inner reel.

However, the technique for displaying symbols using the outer and inner reels has become well known to players. Therefore, a new technique for displaying symbols which arouses the players' interests is desired. Particularly, many types of gaming machines using video reels have recently been known. Since the video reels can effect a variety of display operations, a suitable technique for the video reels to display symbols has been expected.

SUMMARY OF THE INVENTION

It is therefore an object of the invention to provide a gaming machine which can enhance a player's expectation and arouse the player's interest, as well as a method of controlling such a gaming machine.

In order to achieve the above object, according to the invention, there is provided a gaming machine, comprising:

a random number selector, which selects at least one random number;

a display, which displays at least one of plural symbols in accordance with the selected random number, the plural symbols including at least one first symbol which is associated with a second symbol in a one-to-one correspondence; and

a replacement controller, which selects the first symbol with the second symbol when a predetermined requirement is satisfied under a condition that the first symbol is displayed in the display.

In such a configuration, the player cannot determine the nature of the second symbol by only the appearance of the first symbol. Accordingly, when the first symbol has been displayed, the player will have a large expectation for the nature of the second symbol which will appear in association with the first symbol. Moreover, emergence of a second symbol serves as a chance for the player gaining a profit. For example, emergence of the second symbol may be used as a requirement for activating a bonus game or for offering a large amount of payment. As a result, when the first symbol has appeared, the player's interest can be aroused in relation to whether or not the first symbol transforms to the second symbol or in relation to the nature of the second symbol which will appear in association with appearance of the first symbol.

Preferably, the plural symbols includes plural kinds of first symbols appearances of which are different from each other.

In such a configuration, even when the first symbol is displayed, the player encounters difficulty in predicting the nature of the second symbol. As a result, when the first symbol has appeared, the player's expectation can be enhanced.

Preferably, the display first displays the plural symbols variably, and then displays at least one of the plural symbols stationarily in accordance with the selected random number.

In such a configuration, the invention can be applied to a gaming machine equipped with physical reels and video reels.

Here, it is preferable that the predetermined requirement is that a plurality of first symbols are stationarily displayed in the display.

In such a configuration, when one of the first symbol is first displayed, the player's expectation can be enhanced.

It is also preferable that the plural symbols includes at least one third symbol, and the predetermined requirement is that the first symbol and the third symbol are stationarily displayed in the display.

In such a configuration, when the first symbol is displayed, the player's expectation for display of the third symbol can be enhanced. When the first symbol and the third symbol have been displayed, the first symbol transforms to the second symbol, the player's expectation for appearance of the second symbol can be enhanced.

Here, it is preferable that the predetermined requirement is that the first symbol and a plurality of third symbols are stationarily displayed in the display.

In such a configuration, when the first symbol is displayed, the player's expectation for display of the plurality of third symbols can be enhanced. When the first symbol and the plurality of third symbols have been displayed, the first symbol transforms to the second symbol, and the player's expectation for appearance of a second symbol can be enhanced.

It is also preferable that the predetermined requirement is that a predetermined time period elapses from when the first symbol is stationarily displayed in the display.

In such a configuration, when the first symbol is displayed, the player's expectation can be enhanced.

It is also preferable that the gaming machine further comprises a cluster in which the plural symbols are arranged according to a predetermined order with regard to the first symbol. The display comprises a plurality of display areas, each operable to display the plural symbols arranged in the cluster.

In such a configuration, since the clusters are identical with each other in terms of a layout pattern in connection with the first symbol, the player encounters difficulty in predicting appearance of a second symbol associated with the first symbol on the basis of the symbols appearing in the vicinity of the first symbol.

It is alternatively preferable that the gaming machine further comprises a plurality of clusters in which the plural symbols are arranged according to different orders with regard to the first symbol. The display comprises a plurality of display areas, each operable to display the plural symbols arranged in one of the clusters.

In such a configuration, when a certain first symbol has been stationarily displayed, since the pattern into which symbols are to be arranged around the first symbol differs from one cluster to another cluster, the player becomes able to predict a second symbol associated with the first symbol by the symbols located in the vicinity of the first symbol. As a result, a predictive function (declaring occurrence of a win) can be realized, thereby arousing the player's interest.

According to the invention, there is also provided a method of controlling a gaming machine, comprising steps of:

selecting at least one random number;

displaying, in a display, at least one of plural symbols in accordance with the selected random number, the plural symbols including at least one first symbol which is associated with a second symbol in a one-to-one correspondence; and

converting the first symbol into the second symbol when a predetermined requirement is satisfied under a condition that the first symbol is displayed in the display.

Preferably, the plural symbols are variably displayed first, and then at least one of the plural symbols is displayed stationarily in accordance with the selected random number.

BRIEF DESCRIPTION OF THE DRAWINGS

The above objects and advantages of the present invention will become more apparent by describing in detail preferred exemplary embodiments thereof with reference to the accompanying drawings, wherein: [0035]
FIG. 1 is a perspective view showing the appearance of a gaming machine according to an embodiment of the invention; [0036]
FIG. 2 is a block diagram showing the electrical configuration of the gaming machine; [0037]
FIGS. 3 and 4 are flowcharts showing operation performed in the gaming machine; and [0038]
FIGS. 5 through 8 are views showing example displays in a symbol display of the gaming machine. [0039]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

A gaming machine according to an embodiment of the invention will be described hereinbelow. On the basis of a result of internal lottery operation (random number selection), the gaming machine of the embodiment displays a plurality of types of symbols including temporary symbols associated with substantial symbols in a one-to-one correspondence. Here, the substantial symbols have specific designs and characteristics capable of offering a specific payment to a player when appearing on a pay line. On the other hand, the temporary symbols have the function of masking the substantial symbols. The temporary symbols are associated with the substantial symbols in a one-to-one correspondence in advance. When a predetermined requirement has been satisfied, the temporary symbol transforms to the substantial symbol. At this time, the nature of the substantial symbol appears for the first time. The predetermined requirement of the embodiment is that a trigger symbol must appear simultaneously with display of the temporary symbol. Specifically, the trigger symbol has the function of transforming the temporary symbol to the substantial symbol. [0040]
As shown in FIG. 5, a symbol [0041] 62, which shows a submarine pier and appears in a block of a fifth reel 75, is taken as a temporary symbol in the embodiment. Further, as shown in FIG. 5, a symbol 60, which shows a submarine 61 and appears in a block of a first reel 71, is taken as a trigger symbol. As shown in FIG. 7, a symbol 70, which shows a treasure chest and appears in a block of the fifth reel 75, is taken as a substantial symbol. Moreover, as shown in FIG. 8, a symbol 80, which shows ruins and appears in the block of the fifth reel 75, is taken as a substantial symbol. The substantial symbol 70 is given the function of activating a “treasure chest game” when appeared on a pay line. The substantial symbol 80 is given the function of activating a “ruins game” when appeared on the pay line. These substantial symbols are usually displayed as the temporary symbol 62 shown in FIG. 5 so that the player does not know the nature of the symbol.
When the temporary symbol [0042] 62 is displayed along with the trigger symbol 60, the thus-displayed temporary symbol 62 is transformed into a substantial symbol associated therewith. Here, a plurality of types of symbols, including the temporary symbol 62, may be variably displayed. On the basis of a result of internal lottery (random number selection), the variably-displayed symbol may be stationarily displayed, thereby enabling application of the invention to a gaming machine having a physical reel and a video reel. As a result, the player's expectation for a symbol to be stationarily displayed can be enhanced. Further, the player's interest can be aroused in relation to whether or not an appearing temporary symbol is transformed to a substantial symbol and in relation to the nature of a substantial symbol which will appear.
The invention can be applied to all gaming machines capable of displaying symbols. The invention will now be described by taking, as an example, a gaming machine which can variably display a plurality of types of symbols in the direction of a column (or in the direction of a row) and stationarily display the variably-displayed symbol on the basis of a result of internal lottery operation (random number selection). Mechanical drums (reels) may be used for a section of the machine where symbols are to be variably displayed. Alternatively, video reels which variably display symbols as images on a liquid-crystal screen or the like may also be employed. The invention can also be applied to a skilled-stop type gaming machine which enables the player to determine timings at which the drums (reels) are to be stopped and a sequence in which the drums are to be stopped by actuation of stop buttons at the player's will, as in the case of a slot machine. The invention can also be applied to a gaming machine in which reels automatically, sequentially come to a halt regardless of the player's will, as in the case of a slot machine. The embodiment will be described by taking tokens as gaming values. However, the invention is not limited to the tokens; all mediums capable of offering gaming values may be adopted. [0043]
As shown in FIG. 1, a [0044] gaming machine 1 is constituted of a housing 2, and a front panel 3 reclosably attached to the front of the housing 2. Attached to the back of the front panel 3 is a symbol display 7 which is formed from a liquid-crystal panel or cathode ray tube (CRT) and displays symbols in, e.g., five lines. The embodiment adopts a video reel system, and five reels are displayed on the symbol display 7 by execution of a program.
As shown in FIG. 5, the [0045] symbol display 7 has five reels which variably and stationarily display symbols in the direction of a column (i.e., the vertical direction of the gaming machine). Specifically, the symbol display 7 has a first reel 71, a second reel 72, a third reel 73, a fourth reel 74, and a fifth reel 75. Each reel can variably or stationarily display various symbols.
The [0046] symbol display 7 includes a plurality of temporary symbols of identical appearance. Specifically, the temporary symbols each have the same submarine pier. The temporary symbols are associated with different substantial symbols in a one-to-one correspondence. In the symbol display 7, there are formed a plurality of clusters which are identical with each other in terms of a layout pattern into which symbols are to be arranged, with each temporary symbol being taken as a center. Here, the cluster is a group formed from a plurality of symbols. As mentioned above, the plurality of types of symbols are variably displayed in the direction of a column. On the basis of a result of internal lottery, the variably-displayed symbols are stationarily displayed. Since the clusters are identical with each other in terms of a layout pattern into which, when a certain temporary symbol has been displayed, the player encounters difficulty in predicting appearance of a substantial symbol associated with the temporary symbol on the basis of the symbols appearing in the vicinity of the temporary symbol.
For example, there is provided the case of a reel which variably displays symbols in the direction of a column (i.e., the vertical direction of the gaming machine) and three symbols; one in an upper row, one in a middle row, and the other in a lower row. In this case, the respective clusters assume the same layout pattern; that is, two symbols appearing at a position above a temporary symbol, and two other symbols appearing at a position below the temporary symbol. More specifically, under the assumption that symbols are represented as capital letters, the layout pattern of symbols in each cluster is defined as, e.g., “B, C, A, D, E” from the upper side to lower side of the reel. As a result, when temporary symbols are displayed in the upper row, “A, D, E” appear in each cluster. When temporary symbols are displayed in the middle row, “C, A, D” appear in each cluster. When temporary symbols are displayed in the lower row, “B, C, A” appear in each cluster. In this way, symbols, including the temporary symbols, are arranged in the same pattern as are those belonging to the cluster. Since the layout patterns are identical for all the cluster, difficulty is posed on the player in predicting a substantial symbol to which a displayed temporary symbol is transformed, thereby enhancing the player's expectation. [0047]
A [0048] token insertion slot 10 and a token return button 10 a to be used for returning tokens when inserted coins have caused clogging are provided on the front of the housing 2. A start lever 11 is a lever for starting rotational display (variable display) of the symbol display 7.
The [0049] gaming machine 1 starts a game by the player specifying a valid pay line (i.e., a payout line). There player can set a plurality of pay lines, e.g., a horizontal center line, horizontal upper and lower lines, and sloped lines. BET operation is performed by insertion of a token into the token insertion slot 10 to be described later or by betting some of the tokens reserved by a reserved token insert button 21. The BET operation can also be performed by combined use of these BET operations.
When the pay line has been specified through the player's BET operation and the player has actuated the [0050] start lever 11, the symbol display 7 variably displays symbols. When a predetermined period of time has lapsed, the symbol display 7 sequentially stops the variably-displayed symbols. The symbols are stopped in sequence from left to right while the player faces the symbol display 7. At the time of stoppage of the symbols, the symbols are stopped at a time interval of, e.g., 0.5 seconds. When a combination of predetermined symbols is displayed along any of the pay lines as a result of the symbols having come to a halt, a win associated with the combination of symbols is provided.
A [0051] token payout port 15 and a token receiver 16 are provided at a lower portion of the front panel 3. A game presentation indicator 17 which is driven for providing game presentation is provided at an upper portion of the front panel 3. The game presentation indicator 17 is formed from, e.g., an LCD (liquid-crystal display) or lamps of various types. The embodiment shows an example where an LCD is adopted. A bonus game indicator 18 is provided at an upper portion of the front panel 3. The bonus game indicator 18 is formed from an LED (light-emitting diode). The bonus game indicator 18 displays winning or acquisition of a bonus prize which offers a high gaming value to the player, game presentations, and occurrence of an error. Speakers 19 produce sound guidance, music, sound effects, or the like. When a win has arisen for a bonus prize, a game is developed in a manner advantageous to the player; for example, a game is developed such that the probability of occurrence of a win becomes one-third.
A plurality of [0052] lamps 20 provided on the front panel 3 effect display of a game, such as display of a validated pay line or display of occurrence of a win, in accordance with the number of inserted tokens (or the amount of a betted credit) through illumination, extinction, or blinking. The reserved token insert button 21 is for using only a predetermined number of tokens reserved in an unillustrated token storage. A reserved token infusion button 22 is for using a maximum specified number of tokens reserved in the unillustrated token storage. A reserved token count display 23 displays the number of tokens stored in the unillustrated token storage. A win count display 24 displays the number of times a win has arisen or the number of remaining games at the time of occurrence of a win for a bonus prize. A payout token count display 25 displays the number of tokens to be paid. The reserved token count display 23, the win count display 24, and the payout token count display 25 are each formed from, e.g., an LED. A settlement button 26 effects settlement of reserved tokens. A locking device 27 locks a door when turned in a proper direction. The type and manufacturer of the gaming machine 1 are provided on a label 28.
FIG. 2 is a block diagram showing an electrical configuration of the [0053] gaming machine 1 of the embodiment. As shown in FIG. 2, the gaming machine 1 is electrically made up of a main board A and a sub-board B. The main board A has a CPU 30, ROM 31, and RAM 32 and performs control operation in accordance with a preset program. In addition to storing a control program to be used for controlling operation of the gaming machine 1, the ROM 31 stores a prize group sampling table to be used for determining a prize group in advance (through internal lottery). The CPU 30, the ROM 31, and the RAM 32 constitute a symbol selector.
The [0054] CPU 33 is connected to a clock generator 33 for generating a reference clock pulse and to a random number generator 34 for generating a given random number. The CPU 30 and the random number generator 34 constitute a random number selector. By way of an output port 35, a control signal sent from the CPU 30 is output to a token payout device 36, which pays tokens, and to a symbol display controller 37, which controls the symbol display 7.
A signal output from a [0055] token discriminator 38 for determining whether or not a token is genuine; a signal output from a payout token counter 40 for counting the number of tokens to be paid; and a signal output from a start lever 41 which starts spinning of reels are input to the CPU 30 by way of an input port 43. The signal output from the CPU 30 is output to the sub-board B by way of a data transmitter 46 under control of a transmission timing controller 45 for controlling a timing at which a signal is to be transmitted to the sub-board B.
In the sub-board B, the signal output from the [0056] data transmitter 46 is input to a data receiver 47. The signal input to the data receiver 47 is processed by a CPU 48. The CPU 48 is connected to a clock generator 49 for generating a reference clock pulse, ROM 50 having various programs and image data recorded therein, and RAM 51. Data pertaining to images are output from the CPU 48 to a liquid-crystal display 53 via a display processor 52, which performs image processing operation. The liquid-crystal display 53 displays characters, a still image, a moving image, and the like.
Data pertaining to sound are output from the [0057] CPU 48 to an amplifier 56 via a sound LSI 54, which performs sound processing operation. The sound LSI 54 extracts required sound data from sound ROM 55, thereby processing sound data. Sound data which have been subjected to processing, such as amplification, performed by the amplifier 56 are output to a speaker 58 via a sound controller 57.
Operation of the gaming machine of the embodiment having the foregoing configuration will now be described with reference to FIGS. 3 through 8. In FIGS. 5 through 8, symbols other than a temporary symbol [0058] 62, a trigger symbol 60 and substantial symbols 70, 80 are represented as blanks, and specific display of the symbols is omitted.
First, an ordinary game start operation is performed (step S[0059] 1). Here, as mentioned above, one or more pay lines are specified by the BET operation performed by the player, and the start lever 11 is actuated. Next, random numbers to be used for determining stop numbers of the first through fifth reel strips are acquired (step S2). A determination is made as to whether or not a win has arisen for an ordinary game (step S3). Then, spinning of the first through fifth reels is started (step S4).
Spinning of the first through fifth reels is sequentially stopped (step S[0060] 5). Here, the reels are sequentially stopped from the first reel to the fifth reel at predetermined time intervals. Time intervals can be set to a value of, e.g., 0.5 seconds. As shown in FIG. 4, a determination is made as to whether or not a trigger symbol 60 showing a submarine 61 is displayed on the first reel (step S6). Here, as shown in FIG. 5, the trigger symbol 60 is displayed on the first reel 71. Next, a determination is made as to whether or not the symbol showing a submarine pier is displayed in block of the fifth reel 75 (step S7). Here, as shown in FIG. 5, the temporary symbol 62 showing a submarine pier is displayed on in the block of the fifth reel 75. Since the trigger symbol 60 and the temporary symbol 62 have been displayed on the symbol display 7, a requirement for transforming the temporary symbol 62 to a substantial symbol is satisfied.
Next, as shown in FIG. 6, the submarine drawn on the [0061] trigger symbol 60 appearing in the block of the first reel 71 starts moving toward the temporary symbol 62 appearing in the block of the fifth reel 75 (step S8). At this time, in order to enhance the effect of presentations, a pulse sound or the like which is produced when the submarine 61 travels across the ocean floor may be emitted. When the submarine 61 has arrived at the temporary symbol 62 showing the submarine pier, the temporary symbol 62 intensively illuminates, whereupon background scenery for the submarine pier of the temporary symbol 62 appears. A determination is then made as to what is in the background scenery behind the temporary symbol 62 on the fifth reel 75 of the submarine pier (step S9).
As shown in FIG. 7, when a [0062] substantial symbol 70 having a treasure chest drawn is displayed on the fifth reel 75, a treasure chest game is activated (step S10). In contrast, as shown in FIG. 8, if a substantial symbol showing ruins is displayed in the block on the fifth reel 75, a ruins game is activated (step S11). Here, both the treasure chest game and the ruins game are bonus games for offering profits to the player. As a result, when the temporary symbol has appeared, the player can feel premonition of a bonus game.
As mentioned above, the temporary symbol and the substantial symbol are associated with each other in a one-to-one correspondence. If the requirement is not satisfied, the temporary symbol does not transform to the substantial symbol. The requirement is that, in the embodiment, the temporary symbol [0063] 62 and the trigger symbol 60 must be displayed. When the temporary symbol 62 and the trigger symbol 60 have been displayed, the temporary symbol 62 transforms to a corresponding substantial symbol (70 or 80). At this time, the associated substantial symbol becomes evident to the player. Thereby, when the temporary symbol 62 is displayed, the player's expectation for display of the trigger symbol 60 can be enhanced. When the temporary symbol 62 and the trigger symbol 60 have been displayed, the temporary symbol 62 transforms to the substantial symbol (70 or 80), and the player's expectation for appearance of a substantial symbol can be enhanced.
In step S[0064] 6, when the trigger symbol 60 showing a submarine is not displayed in the block of the first reel 71 and when the temporary symbol 62 showing a submarine pier is not displayed in block of the fifth reel 75, processing proceeds to step S12.
Finally, game result processing is performed (step S[0065] 12), and processing returns to a game start standby state.
In the description, the [0066] trigger symbol 60 appears in the first reel 71 and the temporary symbol 62 appears in the fifth reel 75. However, the reel in which each of the trigger symbol 60 and the temporary symbol 62 appears is not limited to the above unless they appear in the same reel.
In the description, one type of symbol; that is, a symbol showing a submarine pier, is used for the temporary symbol [0067] 62. However, a plurality of types of temporary symbols having different appearances may be used. In addition to the symbol showing a submarine pier, a symbol showing a door may be employed. As a result, any of these temporary symbols is displayed, the player encounters difficulty in predicting correspondence between the temporary symbol and a substantial symbol. Thus, when the temporary symbol is displayed, the player's expectation can be enhanced.
Further, display of a plurality of temporary symbols may be employed as the requirement. Specifically, the gaming machine is configured such that temporary symbols can transform to substantial symbols when a plurality of temporary symbols, each showing a submarine pier, are simultaneously displayed. The gaming machine is also configured such that, when the temporary symbol showing a submarine pier and the symbol showing a door are simultaneously displayed, the temporary symbols can transform to substantial symbols. [0068]
In this way, when the plurality of temporary symbols are displayed, each of the temporary symbols transforms to an associated substantial symbol. At this time, the nature of the substantial symbols associated with the temporary symbols becomes evident to the player for the first time, thereby enhancing the player's expectation aroused when the temporary symbol is displayed. [0069]
A plurality of trigger symbols may be provided, and display of a plurality of trigger symbols along with a temporary symbol may be set as the requirement. For example, a symbol showing a door is taken as a temporary symbol; and a symbol showing a key and a symbol showing a submarine are taken as trigger symbols. When the temporary symbol showing a door, the trigger symbol showing a key, and the trigger symbol showing a submarine are displayed simultaneously, presentation is offered such that the door of the temporary symbol is opened and the temporary symbol is transformed into the substantial symbol. [0070]
As mentioned above, when the temporary symbol and the plurality of trigger symbols are displayed, the temporary symbol transforms to an associated substantial symbol. At this time, the substantial symbol associated with the trigger symbols becomes evident. As a result, when the temporary symbol has been displayed, the player's expectation for emergence of a plurality of trigger symbols can be enhanced. When the temporary symbol is displayed in conjunction with a plurality of trigger symbols, the temporary symbol transforms to a substantial symbol. Therefore, the player's expectation for emergence of a substantial symbol can be enhanced. [0071]
Moreover, lapse of a predetermined period of time since a temporary symbol was displayed may also be determined as the requirement. When a predetermined period of time has lapsed since a temporary symbol was displayed, the temporary symbol transforms to an associated substantial symbol. At this time, the nature of the substantial symbol becomes obvious to the player for the first time. As a result, when the temporary symbol has been displayed, the player's expectation for emergence of a substantial symbol can be enhanced. [0072]
Moreover, a plurality of clusters which differ in layout pattern such that symbols are arranged around each temporary symbol may be adopted. As mentioned above, the cluster corresponds to a group formed from a plurality of symbols; that is, a group of symbols. A plurality of types of symbols are variably displayed in the direction of a column, whereas the variably-displayed symbols are stationarily displayed on the basis of result of internal lottery operation. Since the pattern into which symbols are to be arranged around the temporary symbol differs from one cluster to another cluster, the player becomes able to predict a substantial symbol associated with the temporary symbol by the symbols located in the vicinity of the temporary symbol. [0073]
For instance, in the case of the reels which variably display symbols in the direction of a column (i.e., the vertical direction of the gaming machine), there is shown a case where three symbols are displayed; one in an upper row, one in a middle row, and the other in a lower row. In this case, in each cluster, two symbols located in an upward direction with reference to the temporary symbol differ in layout pattern from two symbols located in a downward direction with reference to the same. Specifically, under the assumption that symbols are represented by capital letters and that a symbol showing a submarine pier to be taken as a temporary symbol is taken as symbol A, symbols in a certain cluster are arranged from an upper side to lower side of the reel; for example, “B, C, A, D, E.” In other clusters, symbols may be arranged such as “D, E, A, B, C” or “F, G, A, H, I.”[0074]
Therefore, we assume that symbols of a certain cluster are arranged into a pattern of “B, C, A, D, E” and that the substantial symbol associated with the temporary symbol A is a symbol for starting a bonus game. When the temporary symbol A is displayed in, e.g., an upper row and when symbol “D” has come to the middle row and symbol “E” has come to the lower row, the player can predict that the temporary symbol A is a substantial symbol for activating a bonus game. As a result, a predictive function (declaring occurrence of a win) can be realized, thereby arousing the player's interest. [0075]
The invention can be applied not only to the gaming machine using the foregoing reels, but also to a gaming machine by which the player plays card games, such as poker or black jack, while images of cards are being displayed. For example, the invention can also be applied to a gaming machine which offers a bingo game. [0076]
The previously-described characteristic operations of the gaming machine of the invention are performed by causing a computer to execute a control program. [0077]
The program is available while being recorded on a recording medium, such as a CD-ROM or a DVD. Further, such a program is also available by receiving a signal transmitted from a computer serving also as a transmitter, via a communication network constituted of a transmission medium, such as a public telephone line, a private telephone line, a cable television line, or a radio communication line. The signal is computer data embodied in the form of a predetermined carrier wave including a program. At the time of transmission, the only requirement is to transmit at least a portion of the program over the transmission medium. Namely, there is no necessity for all the data constituting the program to exist in the transmission medium at a single time. A method for transmitting the program from the computer includes a situation in which data constituting the program are consecutively transmitted and a situation in which the data are transmitted intermittently. [0078]
Although the present invention has been shown and described with reference to specific preferred embodiments, various changes and modifications will be apparent to those skilled in the art from the teachings herein. Such changes and modifications as are obvious are deemed to come within the spirit, scope and contemplation of the invention as defined in the appended claims. [0079]

Claims

What is claimed is:

1. A gaming machine, comprising:

a random number selector, which selects at least one random number;

a replacement controller, which replaces the first symbol with the second symbol when a predetermined requirement is satisfied under a condition that the first symbol is displayed in the display.

2. The gaming machine as set forth in claim 1, wherein the display first displays the plural symbols variably, and then displays at least one of the plural symbols stationarily in accordance with the selected random number.

3. The gaming machine as set forth in claim 1, wherein the plural symbols includes plural kinds of first symbols appearances of which are different from each other.

4. The gaming machine as set forth in claim 2, wherein the predetermined requirement is that a plurality of first symbols are stationarily displayed in the display.

5. The gaming machine as set forth in claim 2, wherein the plural symbols includes at least one third symbol, and the predetermined requirement is that the first symbol and the third symbol are stationarily displayed in the display.

6. The gaming machine as set forth in claim 5, wherein the predetermined requirement is that the first symbol and a plurality of third symbols are stationarily displayed in the display.

7. The gaming machine as set forth in claim 2, wherein the predetermined requirement is that a predetermined time period elapses from when the first symbol is stationarily displayed in the display.

8. The gaming machine as set forth in claim 2, further comprising a cluster in which the plural symbols are arranged according to a predetermined order with regard to the first symbol,

wherein the display comprises a plurality of display areas, each operable to display the plural symbols arranged in the cluster.

9. The gaming machine as set forth in claim 2, further comprising a plurality of clusters in which the plural symbols are arranged according to different orders with regard to the first symbol,

wherein the display comprises a plurality of display areas, each operable to display the plural symbols arranged in one of the clusters.

10. A method of controlling a gaming machine, comprising steps of:

selecting at least one random number;

replacing the first symbol with the second symbol when a predetermined requirement is satisfied under a condition that the first symbol is displayed in the display.

11. The method as set forth in claim 10, wherein the plural symbols are variably displayed first, and then at least one of the plural symbols is displayed stationarily in accordance with the selected random number.

12. The method as set forth in claim 11, wherein the predetermined requirement is that a plurality of first symbols are stationarily displayed in the display.

13. The method as set forth in claim 11, wherein the plural symbols includes at least one third symbol, and the predetermined requirement is that the first symbol and the third symbol are stationarily displayed in the display.

14. The method as set forth in claim 13, wherein the predetermined requirement is that the first symbol and a plurality of third symbols are stationarily displayed in the display.

15. The method as set forth in claim 11, wherein the predetermined requirement is that a predetermined time period elapses from when the first symbol is stationarily displayed in the display.