How to play?
When you start a level, you will see the board for a moment. Then they will disappear. You are expected to tap on shown squares before.
How will you lose?
If you tap on any unshown squares, you will lose a life. If the time ends before you tap all of the shown squares, you will lose a life too. When you lose all your lives, the game will end automatically.
This is a pretty hard game. Concentration is all you need to succeed. Can you become the best player?