Tap the glowing BLUE cell before it fades out. Never tap the RED trap cell — that's instant game over. Missing a blue cell costs a life; you have 3.
Flash Grid is a free online reflex grid game: a random cell flashes blue and you must tap it before it fades, while occasional red trap cells must never be touched. The lit window shrinks and traps appear more often as your score climbs, making split-second color recognition and restraint the key to a high score in this brutally hard reaction test.