The screen is covered with colored sprites (squares or circles). When you align
3 or more in a row, all adjacents sprites of the shape & color vanish.

You can only swap adjacent sprites vertically or horizontally. You can swap
sprites even if it won't result in a 3-or-more alignment, but that will cost you
10% of your current score.

The game offers two variations on the gameplay and manages a list of current
games, that you can pause and recall at any time.