# Patent

## Title
Gaming machine with history display

## Abstract

A gaming system comprises a history display and a controller. The history display tracks a plurality of past outcomes of a wagering game. The controller awards a bonus if a current outcome of the wagering game has a predetermined association with at least one of the displayed plurality of past outcomes.

## Background
REFERENCE TO RELATED APPLICATIONS
This application is a continuation of U.S. Non Provisional application Ser. No. 10/375,675, filed Feb. 26, 2003, which is a continuation in part application of and claims priority from U.S. application Ser. No. 10/242,014, filed Sep. 12, 2002, which are both incorporated herein by reference in their entirety


FIELD OF THE INVENTION
The present invention relates generally to gaming machines and, more particularly, to a gaming machine for awarding a bonus if a current game outcome has a predetermined association with at least one of a displayed plurality of past outcomes.
BACKGROUND OF THE INVENTION
Gaming machines, such as slot machines, video poker machines and the like, have been a cornerstone of the gaming industry for several years. Generally, the popularity of such machines with players is dependent on the likelihood (or perceived likelihood) of winning money at the machine and the intrinsic entertainment value of the machine relative to other available gaming options. Where the available gaming options include a number of competing machines and the expectation of winning each machine is roughly the same (or believed to be the same), players are most likely to be attracted to the most entertaining and exciting of the machines. Shrewd operators consequently strive to employ the most entertaining and exciting machines available because such machines attract frequent play and hence increase profitability to the operator. Accordingly, in the competitive gaming machine industry, there is a continuing need for gaming machine manufacturers to produce new types of games, or enhancements to existing games, which will attract frequent play by enhancing the entertainment value and excitement associated with the game.
One concept that has been successfully employed to enhance the entertainment value of a game is the concept of a “secondary” or “bonus” game that may be played in conjunction with a “basic” game. The bonus game may comprise any type of game, either similar to or completely different from the basic game, which is entered upon the occurrence of a selected event or outcome of the basic game. Because the bonus game concept offers tremendous advantages in player appeal and excitement relative to other known games, and because such games are attractive to both players and operators, there is a continuing need to develop new features and themes for bonus games to satisfy the demands of players and operators. Preferably, such new bonus game features and themes will maintain, or even further enhance, the level of player excitement offered by bonus games heretofore known in the art. The present invention is directed to satisfying these needs.
SUMMARY OF THE INVENTION
Accordingly, the present invention is directed to a gaming system including a history display and a controller. The history display tracks a plurality of past outcomes of a wagering game. The controller awards a bonus if a current outcome of the wagering game has a predetermined association with at least one of the displayed plurality of past outcomes.



BRIEF DESCRIPTION OF THE DRAWINGS
The foregoing and other advantages of the invention will become apparent upon reading the following detailed description and upon reference to the drawings.
FIG. 1 is an isometric view of a gaming machine embodying the present invention.
FIG. 2 is a block diagram of a control system suitable for operating the gaming machine.
FIG. 3 is a display image on a primary display showing a basic slot game conducted on the gaming machine.
FIG. 4 is a display image on a secondary display showing a record of past winning symbol combinations and respective bonus multipliers if a player's next winning combination is a repeat of one of those past winning combinations.
FIG. 5 is a display image on the primary display showing a winning combination of four LAS VEGAS SIGN reel symbols.
FIG. 6 is a display image on the secondary display showing that the winning combination in FIG. 5 matches one of the past winning combinations shown on the secondary display.
FIG. 7 is a display image on the secondary display showing a revised record of past winning symbol combinations and respective bonus multipliers after removing the oldest of the past winning combinations in FIG. 4 and adding the most recent winning combination in FIG. 5.
FIG. 8 shows a common history display connected to a bank of gaming machines through a controller.



While the invention is susceptible to various modifications and alternative forms, specific embodiments have been shown by way of example in the drawings and will be described in detail herein. It should be understood, however, that the invention is not intended to be limited to the particular forms disclosed. Rather, the invention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.
DESCRIPTION OF ILLUSTRATIVE EMBODIMENTS
Turning now to the drawings, FIG. 1 depicts a gaming machine 10 operable to conduct a wagering game such as slots, poker, keno, bingo, blackjack, and lottery-type games. In operation, the gaming machine receives a wager from a player to purchase a “play” of the game. In a “play” of the game, the gaming machine generates at least one random event using a random number generator (RNG) and provides an award to the player for a winning outcome of the random event. The random event(s) varies with the type of wagering game conducted on the gaming machine.
The gaming machine 10 includes a primary video display 12 such as a CRT, LCD, plasma, or other type of video display known in the art. The display 12 is optionally overlaid with a touch screen to facilitate interaction with the player. In the illustrated embodiment, the gaming machine 10 is a “slant-top” version in which the display 12 is slanted at an angle toward the player of the gaming machine 10. Alternatively, the gaming machine 10 may be an “upright” version in which the display 12 is oriented vertically relative to the player. In addition to the display 12, the gaming machine 10 may include a secondary video display 13 mounted to and extending upward from a rear portion of the machine cabinet. If the wagering game includes both a basic game and a bonus feature (as in the present invention), the primary display 12 is primarily used to depict the basic game, and the secondary display 13 is primarily used to depict the bonus feature.
FIG. 2 is a block diagram of a control system suitable for operating the gaming machine 10. Money/credit detector 16, also denoted herein as a value input device, signals a central processing unit (CPU) 18 when a player has inserted money or played a number of credits. The money may be provided by coins, bills, tickets, coupons, cards, etc. Using an electronic input device, such as a button panel 14 (see FIG. 1) or the touch screen 20, the player may select any variables associated with the wagering game and place his/her wager to purchase a play of the game. In a play of the game, the CPU 18 generates at least one random event using a random number generator (RNG) and provides an award to the player for a winning outcome of the random event. If the wagering game includes a basic game and a bonus feature, the primary display 12 is primarily used to represent the random events and outcomes associated with the basic game, and the secondary display 13 is primarily used to represent the random events and outcomes associated with bonus game. In addition to the CPU 18, the control system may include one or more additional slave control units, also denoted herein as controllers, for operating one or more of the displays 12 and 13.
A system memory 22 stores control software, operational instructions and data associated with the gaming machine 10. In one embodiment, the system memory 22 comprises a separate read-only memory (ROM) and battery-backed random-access memory (RAM). However, it will be appreciated that the system memory 22 may be implemented on any of several alternative types of memory structures or may be implemented on a single memory structure. A payoff mechanism 24 is operable in response to instructions from the CPU 18 to award a payoff to the player. The payoff may, for example, be in the form of a number of credits. The number of credits are determined by one or more math tables stored in the system memory 22.
In accordance with the present invention, the gaming machine 10 may track and display a predetermined or variable number of past outcomes and integrate such outcomes into the play of the game. The present invention is described below in the context of a wagering game including a basic video slot game and a “match to win” bonus feature. It should, however, be understood, that the invention can also be applied to other wagering games.
Referring to FIG. 3, the video slot game is implemented on the video display 12 on a number of video simulated spinning reels 30 with a number of pay lines 32. Each of the pay lines 32 extends through one symbol on each of the reels 30. Generally, game play is initiated by inserting money or playing a number of credits, causing the CPU to activate a number of pay lines corresponding to the amount of money or number of credits played. In one embodiment, the player selects the number of pay lines to play by pressing a “Select Lines” touch key on the display 12. The player then chooses the number of coins or credits to bet on the selected pay lines by pressing a “Bet Per Line” touch key.
After activation of the pay lines, the reels 30 may be set in motion by pressing a “Spin Reels” touch key or, if the player wishes to bet the maximum amount per line, by using a “Max Bet Spin” touch key on the display 12. Alternatively, other mechanisms such as a lever or push button may be used to set the reels in motion. The CPU uses a random number generator to select a game outcome (e.g., “basic” game outcome) corresponding to a particular set of reel “stop positions.” The CPU then causes each of the reels 30 to stop at the appropriate stop position. Video symbols are displayed on the reels 30 to graphically illustrate the reel stop positions and indicate whether the stop positions of the reels 30 represent a winning game outcome.
Winning basic game outcomes (e.g., symbol combinations resulting in payment of coins or credits) are identifiable to the player by a pay table. In one embodiment, the pay table is affixed to the machine 10 and/or displayed by the display 12 in response to a command by the player (e.g., by pressing a “Pay Table” touch key)(see e.g., FIG. 3). A winning basic game outcome occurs when the symbols appearing on the reels 30 along an active pay line correspond to one of the winning combinations on the pay table. A winning combination, for example, could be three or more matching symbols along an active pay line, where the award is greater as the number of matching symbols along the active pay line increases. If the displayed symbols stop in a winning combination, the game credits the player an amount corresponding to the award in the pay table for that combination multiplied by the amount of credits bet on the winning pay line. The player may collect the amount of accumulated credits, also referred to herein as a “Credit Balance,” by pressing a “Collect” touch key, also referred to herein as a “Cashout” or “Collect” input (see e.g., FIG. 3). In one implementation, the winning combinations start from the first reel (left to right) and span adjacent reels. In an alternative implementation, the winning combinations start from either the first reel (left to right) or the fifth reel (right to left) and span adjacent reels.
In accordance with the present invention, the gaming machine may track a predetermined number (e.g., four) of past winning symbol combinations, display the past winning combinations on the secondary video display 13, and provide a “repeat win” or “match to win” bonus to the player if a current play of the game yields one of the past winning combinations shown on the secondary display 13. The “repeat win” bonus may, for example, be a secondary game feature, a credit amount, or a bonus multiplier (i.e., multiplication of the normal payout for the winning combination by the multiplier). Past winning combinations may enter and leave the secondary display 13 in a first-in, first-out (FIFO) scheme, random scheme, or a ranked/priority scheme where winning combinations remain on the display 13 for different periods of time based on such factors as probability of occurrence, payout value, previous “repeat win” bonuses, etc. A past winning combination on the secondary display 13 may be immediately removed from the display 13 in response to a “repeat win” bonus involving that combination, or may remain on the display 13 until removed by virtue of normal operation of the selected scheme. After a player terminates his/her game session, the secondary display 13 may continue to display the past winning combinations that were displayed just prior to session termination, may be reset to display no past winning combinations, or may display a predetermined or random starting set of winning combinations.
In one embodiment shown in FIG. 4, the secondary display 13 depicts a record of the past four winning symbol combinations 40a, 40b, 40c, and 40d (collectively “40”) and respective bonus multipliers 42a, 42b, 42c, and 42d if the player's next winning combination is a repeat of one of those four winning combinations 40. The “repeat win” bonus may vary for different winning combinations. For example, if the “repeat win” bonus is a bonus multiplier, the multiplier may vary with the probability of achieving the winning combination such that, for example, the lower the probability of achieving the winning combination, the higher the multiplier. The bonus multiplier for repeating a less probable winning combination of five U.S. MINT symbols 40d shown on the secondary display 13 may be a multiplier 42d of 20×, while the bonus multiplier for repeating a more probable winning combination of three U.S. MINT symbols 40a may be a multiplier 42a of 3×. If a current play of the game yields a winning combination that appears more than once on the secondary display, the “repeat win” bonus may enhanced, e.g., repeated by the number of times that the winning combination appears on the display.
In the example illustrated in FIGS. 5, 6, and 7, a current play of the video slot game yields a winning combination of four LAS VEGAS SIGN symbols 40b (see FIG. 5). As shown in FIG. 6, this winning combination 40b was one of the past four recorded winning combinations and has a “repeat win” bonus multiplier 42b of 5×. Therefore, the secondary display 13 highlights the winning combination 40b and awards the player with five (5) times the normal payout for the winning combination 40b. If the normal payout is 50 credits, the player is awarded 250 credits (i.e., 250 credits=5×50 credits). As shown in FIG. 7, the secondary display 13 removes the oldest (e.g., lowermost combination 40d in FIG. 6) of the past four winning combinations from the lower position, shifts the remaining three winning combinations downward to occupy the vacated lower position, and adds the most recent winning combination of four LAS VEGAS SIGN symbols 40b to the upper position. Alternatively, the oldest of the past four winning combinations may occupy the upper position such that the secondary display 13 removes the oldest of the past four winning combinations from the upper position, shifts the remaining three winning combinations upward to occupy the vacated upper position, and adds the most recent winning combination to the lower position.
While the present invention has been described with reference to one or more particular embodiments, those skilled in the art will recognize that many changes may be made thereto without departing from the spirit and scope of the present invention. For example, instead of only tracking past winning outcomes on the secondary display, the history information may track past losing outcomes, any past outcomes (winning or losing), past symbols, or other past events and provide a “repeat event” bonus to the player if a current play yields one of the past events shown on the secondary display. Furthermore, instead of only tracking past winning outcomes for a single machine, the present invention contemplates tracking past winning outcomes for a plurality of machines (e.g., bank of machines) linked to a common secondary display (e.g., bank tracker). Referring to FIG. 8, the common display 50 may, for example, track the past ten winning outcomes that occurred in the plurality of gaming machines 10. The gaming machines 10 are linked to the common display 50 via controller 52. Each of these embodiments and obvious variations thereof is contemplated as falling within the spirit and scope of the claimed invention, which is set forth in the following claims:

## Claims

1. A gaming system configured to conduct a casino wagering game, the gaming system comprising:
a gaming machine for playing at least one casino wagering game, the gaming machine including at least one electronic display device and one or more electronic input devices, at least one of the one or more electronic input devices comprising a value input device;
a physical computer-readable memory device configured to store a plurality of past outcomes of the casino wagering game, the plurality of past outcomes being defined by symbol combinations in a paytable corresponding to the casino wagering game;
at least one of one or more controllers configured to:
detect, via the value input device, a physical item associated with a monetary value that establishes a credit balance;
initiate the casino wagering game in response to an input indicative of a wager covered by the credit balance;
direct the at least one electronic display device of the gaming machine to display an outcome of the casino wagering game;
award an award by updating the credit balance in response to the outcome meeting a predetermined award criterion defined by symbol combinations in the paytable, and
receive, via at least one of the one or more electronic input devices, a collect input that initiates a payout from the credit balance;

the at least one of the one or more controllers being further configured to:
store the outcome in the physical computer-readable memory device as one of the plurality of past outcomes of the casino wagering game in response to the outcome being defined by a symbol combination in the paytable;
display on the at least one electronic display device the plurality of past outcomes of the casino wagering game stored in the physical computer-readable memory device, the plurality of past outcomes including a first past outcome represented on the at least one electronic display device by a first award level of the symbol combinations in the paytable and a second past outcome represented on the at least one electronic display device by a second award level of the symbol combinations in the paytable, the first award level being different than the second award level, the second past outcome being independent of the first past outcome; and
award, apart from any award awarded in response to the outcome meeting the predetermined award criterion, an enhanced award if the outcome of the casino wagering game meets a predetermined enhanced award criterion, the enhanced award being derived from at least one of the plurality of past outcomes displayed in the at least one electronic display device and comprising at least one of the first award level or the second award level.

2. The gaming system of claim 1, wherein the casino wagering game is conducted via a single gaming machine.

3. The gaming system of claim 1, wherein the casino wagering game is conducted via a plurality of gaming machines linked to the at least one of one or more controllers.

4. The gaming system of claim 3, wherein the at least one electronic display device is common to the plurality of gaming machines and wherein the at least one of one or more controllers are configured to award the enhanced award derived from the plurality of past outcomes if the outcome of the casino wagering game for any of the plurality of gaming machines meets the predetermined criterion.

5. The gaming system of claim 1, wherein the plurality of past outcomes comprises winning outcomes, and wherein the first past outcome and the second past outcome are winning outcomes.

6. The gaming system of claim 1, wherein the plurality of past outcomes comprises losing outcomes.

7. The gaming system of claim 1,
wherein the plurality of past outcomes comprises winning outcomes and losing outcomes,
wherein one of the first past outcome and the second past outcome is a winning outcome, and
wherein the other one of the first past outcome and the second past outcome is a losing outcome.

8. The gaming system of claim 1, wherein the plurality of past outcomes comprises non-consecutive winning outcomes.

9. The gaming system of claim 1, wherein the plurality of past outcomes are added to and removed from the history display using a first-in, first-out scheme.

10. The gaming system of claim 1, wherein the predetermined criterion is a match between the outcome and at least one of the plurality of past outcomes.

11. The gaming system of claim 1, wherein at least one of the first award level or the second award level comprises a credit amount and wherein the enhanced award comprises a credit amount.

12. The gaming system of claim 1, wherein a number of past outcomes in the plurality of past outcomes in the at least one electronic display device is invariant.

13. A method of operating a gaming system, the gaming system including one or more controllers and a gaming machine for playing at least one casino wagering game, the gaming machine including at least one electronic display device and one or more electronic input devices, at least one of the one or more electronic input devices comprising a value input device, the method comprising:
detecting, via the value input device, a physical item associated with a monetary value that establishes a credit balance;
initiating the casino wagering game in response to an input indicative of a wager covered by the credit balance;
randomly determining, by the at least one of one or more controllers, an outcome of the casino wagering game;
displaying the outcome on the at least one electronic display device of the gaming machine;
awarding, by the at least one of one or more controllers, an award in response to the outcome meeting a predetermined award criterion;
storing, in the physical computer-readable memory device, the plurality of past outcomes of the casino wagering game, the plurality of past outcomes being defined by symbol combinations in a paytable;
displaying, on the at least one electronic display device operatively associated with the wagering game machine, representations of the plurality of past outcomes of the casino wagering game stored in the physical computer-readable memory device, the plurality of past outcomes being independent of one another;
determining, using the at least one of one or more controllers, if the outcome of the casino wagering game satisfies a predetermined criterion relative to the plurality of past outcomes;
determining, using the at least one of the one or more controllers, an enhanced award associated with the outcome if the outcome of the casino wagering game satisfies the predetermined criterion relative to the plurality of past outcomes, the enhanced award being dependent on at least one of the plurality of past outcomes;
awarding, by the at least one of one or more controllers, the enhanced award in response to the outcome meeting the predetermined criterion relative to the plurality of past outcomes, and
receiving, via at least one of the one or more electronic input devices, a cashout input that initiates a payout from the credit balance.

14. The method of conducting a wagering game on a wagering game machine according to claim 13, further comprising the act of updating the at least one electronic display device by adding the outcome of the casino wagering game to the plurality of past outcomes displayed on the at least one electronic display device and by removing from the at least one electronic display device another one of the plurality of past outcomes.

15. The method of conducting a casino wagering game according to claim 13, wherein a number of past outcomes in the plurality of past outcomes in the at least one electronic display device is invariant.

16. A gaming system configured to conduct a casino wagering game, the gaming system comprising:
a gaming machine for playing at least one casino wagering game, the gaming machine including at least one electronic display device and one or more electronic input devices, at least one of the one or more electronic input devices comprising a value input device;
a physical computer-readable memory device configured to store a plurality of past outcomes of the casino wagering game, the plurality of past outcomes being defined by symbol combinations in a paytable, the plurality of past outcomes being independent of one another;
at least one of one or more controllers configured to:
detect, via the value input device, a physical item associated with a monetary value that establishes a credit balance;
initiate the casino wagering game in response to an input indicative of a wager covered by the credit balance;
randomly determine an outcome of the casino wagering game;
direct the at least one electronic display device of the gaming machine to display the outcome;
award an award in response to the outcome meeting a predetermined award criterion defined by symbol combinations in a paytable; and
receive, via at least one of the one or more electronic input devices, a cashout input that initiates a payout from the credit balance, the at least one of the one or more controllers being further configured to:
display on the at least one electronic display device the plurality of past outcomes of the casino wagering game stored in the physical computer-readable memory device, the history display being further configured, responsive to the outcome of the casino wagering game, to add the outcome of the casino wagering game to the at least one electronic display device and to remove another one of the plurality of past outcomes from the at least one electronic display device; and

award an enhanced award derived from at least one of the plurality of past outcomes if the outcome of the wagering game meets a predetermined enhanced award criterion derived from at least one of the plurality of past outcomes displayed in the at least one electronic display device.

17. The gaming system of claim 16, wherein the casino wagering game is conducted via a single gaming machine.

18. The gaming system of claim 16, wherein the casino wagering game is conducted via a plurality of gaming machines linked to the at least one of one or more controllers.

19. The gaming system of claim 18, wherein the at least one electronic display device is common to the plurality of gaming machines.

20. The gaming system of claim 16, wherein the plurality of past outcomes comprises only winning outcomes.

21. The gaming system of claim 16, wherein the plurality of past outcomes comprises losing outcomes.

22. The gaming system of claim 16, wherein the plurality of past outcomes comprises winning outcomes and losing outcomes.

23. The gaming system configured to conduct a casino wagering game according to claim 16, wherein a number of past outcomes in the plurality of past outcomes in the at least one electronic display device is invariant.