MemoIt (genius)

If you've played genius/simon you already know this game, if not it has four buttons with different colors and sound and the goal is repeat the sequence machine does. The catch here is, every round another button is added to sequence so for example round 1: one button (let's say blue button), round 2: two buttons (first is button blue and now it is added button yellow) and it goes until you err the sequence =)