This game have only one rule: you can select only group of stones, not isolated.

Stones formed group must have at least one side shared with another stone and stones in group must have same picture.

If you click such group, it will vanish from game board, stones lay above fall down and you earn points.

You earn one point for every vanished stone and plus two points for stone, for each stone after fours stone in a group, and add three points for any stone after tens one, and four points for stones after 20ts stone.