Game machine with concentrative prize mode

• US 6,302,794 B1
• Filed: 02/26/1999
• Issued: 10/16/2001
• Est. Priority Date: 02/27/1998
• Status: Expired due to Term

• Current Assignee: Universal Entertainment Corporation
• Original Assignee: Aruze Corp. (Universal Entertainment Corporation)
• Inventors: Ogawa, Masaki
• Primary Examiner(s): ONEILL, MICHAEL W
• Application Number:
  US09/258,808
• Time in Patent Office: 963 Days
• Field of Search: 463/16-20, 463/21, 463/22, 463/25, 463/26, 463/27, 463/12, 463/13, 273/138.1, 273/138.2, 273/143 R, 273/148 B, 273/121 B, 273/FOR 138 A, 273/FOR 143 R
• US Class Current: 463/25
• CPC Class Codes: G07F 17/3244 Payment aspects of a gaming system, e.g. payment schemes, setting payout ratio, bonus or consolation prizes

Abstract

A game machine capable of providing proper expected values.

The game machine is provided with a prize decision table to be applied to a game in an ordinary probability game state and a prize decision table to be applied to a game in a high probability game state. The former and latter prize decision tables are stored with at least data of numbers of lottery random numbers for providing basis of the individual lottery probabilities for individual prize modes. By increasing the number of lottery random numbers for a predetermined mode in the high probability game state but by decreasing the number of lottery random numbers for another mode, the prize probability of the predetermined mode is enhanced, and an expected value to be obtained in the high probability game state is set to a proper expected value or less.

Claims

1. A game machine having an ordinary game state in which a plurality of prize modes occur and a high probability game state in which said plurality of prize modes occur and a prize probability of a predetermined one of said plurality of prize modes is enhanced, and adapted to be transferred, when a predetermined condition is satisfied, from said ordinary game state to said high probability game state,

wherein a prize probability of at least one prize mode other than said predetermined prize mode among said predetermined prize modes which occur in said high probability game state is set lower than a prize probability of said at least one prize mode which occur in said ordinary game state.

2. A game machine according to claim 1,

wherein said plurality of prize modes are lotted by a random sampling so that the prize probability of a predetermined prize mode in said high probability game state is enhanced by increasing the number of the lottery random numbers for said predetermined prize mode whereas the prize probability of said one other than said predetermined prize mode in the high probability game state is lessened by reducing the number of the lottery random numbers for said one other than said predetermined prize mode.

3. A game machine according to claim 2,

wherein the prize probabilities of a plurality of said ones other than said predetermined prize mode in the high probability game state are lessened by reducing the numbers of the lottery random numbers for said ones other than said predetermined prize mode.

4. A game machine according to claim 2,

wherein prize decision tables to be used at the time of a prize decision in a game routine are prepared for said ordinary probability game state and for said high probability game state,

wherein the number of the lottery random numbers for said predetermined prize mode, as stored in the prize decision table for said high probability game state, is made larger than the number of the lottery random numbers for said predetermined prize mode, as stored in the prize decision table for said ordinary probability game state, and

wherein the number of the lottery random numbers for said one other than said predetermined prize mode, as stored in the prize decision table for said high probability game state, is made smaller than the number of the lottery random numbers for said one other than said predetermined prize mode, as stored in the prize decision table for said ordinary probability game state.

5. A game machine according to claim 4,

wherein the total of expected values for the individual prize modes, as indicating numerical values of how much payout of game medium to be bet for a game can be expected at the unit of the game medium, is set at a higher value in said high probability game state than in said ordinary probability game state.

6. A game machine according to claim 5,

wherein a expected value of said expected values for said predetermined prize mode is set at a higher value in said high probability game state than that in said ordinary probability game state whereas a expected value of said expected values for said one other than said predetermined prize mode is set at a lower value in said high probability game state than that in said ordinary probability game state, so that said total of the expected values for the prize decision table in said high probability game state is set at a desired proper value.

7. A game machine according to claim 6,

wherein said total of the expected values for the prize decision table in said high probability game state is set at the desired proper value by adjusting the individual expected values of a plurality of said ones other than said predetermined prize mode.

8. A game machine according to claim 2,

wherein said predetermined prize mode is a high bonus mode whereas said one other than said predetermined prize mode is a low bonus mode.

9. A game machine according to claim 3,

wherein said predetermined prize mode is a high bonus mode whereas a plurality of said ones other than said predetermined prize mode are low bonus modes.

10. A game machine according to claim 8 or claim 9,

wherein said predetermined prize mode is a single bonus game.