[zacharycohn]

Musical hacks. It sounds like he hit STOP every time a certain note played. Maybe he noticed a pattern that whenever someone hit "stop" on that note it landed on a "big bucks" icon. So account for reaction time/delay, and ta-daa. $100,000.

[AntiRush]

He realized that there were a set number of patterns. Once he figured that out it was easy to hit the button when the next square was going to be the one he wanted.