Object of this game is it to remove as much stones as possible with one click. But you only can remove stones, if at least 3 stones of the same color lie together. Depending on your score, there come new stones from downside with changing speed. If you collected sufficient points, the number of colors increases to make the game a bit more difficult.
Clicker 1.8 has got a new cheat with the Shift-key. Give it a try !