Other rules include a 15 coin payout cap, a 50 credit cap on machines, a 3 coin maximum bet, and other such regulations. Indeed, Japanese slot machines are "beatable". The Atlantic Monthly Group. Australian-style gaming machines frequently use video displaysto simulate physical reels, usually five. These machines usually allow a player to either take a payout, or gamble it on a double-or-nothing "side game". Category B edit Category B games are divided into subcategories. The American Mensa Guide to Casino Gambling: Winning Ways (Stirling, 1999) ISBrochowski, John. Retrieved 28 November 2015. Random number generators edit All modern machines are designed using pseudo random number generators prngs which are constantly generating a sequence of simulated random numbers, at a rate of hundreds or perhaps thousands per second.