The bug allowed for some serious exploitation:
Kane began by selecting a game, like Triple Double Bonus Poker, and playing it at the lowest denomination the machine allows, like the $1.00 level. He kept playing, until he won a high payout, like the $820 at the Silverton.
Then he’d immediately switch to a different game variation, like straight “Draw Poker.” He’d play Draw Poker until he scored a win of any amount at all. The point of this play was to get the machine to offer a “double-up”, which lets the player put his winnings up to simple high-card-wins draw. Through whatever twist of code caused the bug, the appearance of the double-up invitation was critical. Machines that didn’t have the option enabled were immune.
At that point Kane would put more cash, or a voucher, into the machine, then exit the Draw Poker game and switch the denomination to the game maximum — $10 in the Silverton game.
Now when Kane returned to Triple Double Bonus Poker, he’d find his previous $820 win was still showing. He could press the cash-out button from this screen, and the machine would re-award the jackpot. Better yet, it would re-calculate the win at the new denomination level, giving him a hand-payout of $8,200.
http://www.wired.com/threatlevel/2013/05/game-king/
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