Click in turn on any 4 neighbouring tiles located in the form of one of the figures of tetromino, and these tiles will be removed.
When you remove all the yellow tiles in this way, the next level of the game will begin.

To deselect a tile, click on it again.

To cancel the last removal, click on the button in the lower right corner.

To return to the beginning of the level, click on the second button on the right.

The game has 140 levels with a gradually increasing complexity.

The current level number is shown in the lower part of the screen.

To choose an arbitrary level, use a slider and buttons at the top of the screen.

To choose a random level, click on the second on the left button at the bottom of the screen.