The game is based on reaction time. There are different color squares that flash randomly and if they aren't tapped quickly, you lose. Also, there are two types of flashes, a bright flash and a dull flash. If you tap the dull flash you lose. There are four different difficulties, and when the score reaches 100, the level is beaten. Lastly, as the score raises, the amount of time you have to tap the flash decreases so there is no time for hesitation.