By tapping on the minimal number, the player will gradually clear the board. The game ends when there is no number left or the time is up.
- Level 1: the numbers are consecutive and ranging from 1 to 81
- Level 2: the numbers are not necessarily consecutive and may begin with any number between 1 and 3
- Level 3: the player plays against artificial intelligence and the numbers are consecutive, ranging from 1 to 81