To win you have to put away all the stones on the playfield. If you click on one location then 4 stones to the right and 4 stones under that position will be inverted. That means all stones there get deleted and all stones deleted will now be set. There are extras that you can find, a heart increases your lives, a clock increases your time a bomb destroys 16 stones but it a trap. The arrow pushes you to the next level and a bag gives you a score bonus.