Start from the top-left corner and aim for the yellow goal at the bottom-right corner.
Players can only move up, down, left, or right. You can use the keypad displayed at the bottom of the screen or the ←↑→↓ keys on your keyboard if playing on a PC.
Some squares are filled with blocks. You cannot pass through these blocks, but you can break them a limited number of times by attempting to move towards them. The number of times you can break blocks is shown as ● at the bottom of the screen. This number increases slightly each time you clear a stage (with more added as you progress to later stages).
The game is over when the yellow gauge is empty. The yellow gauge decreases with each square moved or as time passes and is replenished slightly with each stage cleared.
Clearing a stage advances you to the next stage. As the stage number increases, the number of filled blocks also increases, raising the difficulty level.