Stackems

Using only your head, and blocks made out of strange materials, you must complete objectives on 15 challenging levels! Can't figure out how to beat one? No problem; you can always try another one and come back to it later. Get your friends in on the action and see who can solve the levels in the fewest moves!

Instructions are included, but the basic idea is that there are several types of blocks (water, explosive, self-replicating, etc.) which you must drop into place so that they will react with each other, in a way that achieves some goal, like eliminating a specific block that was tucked away somewhere in the level. Good luck!