World of Goo is a physics based puzzle / construction game. The millions of Goo Balls who live in the beautiful World of Goo don’t know that they are in a game, or that they are extremely delicious.
The full game costs $20, but the first chapter is available for free as a demo, so you may want to check that out first.
Read all about the game here.
For Foresight Linux users, open terminal and write:
sudo conary update worldofgoo=zinden.rpath.org@fl:2-devel
(only for 32bit though)