To Penumbra Makers!

[Thaliur]

hmm, or maybe in a patch?

Penumbra's physics engine practically begs for "scientific" minigames
Catapult targeting would work too, I guess.
Just create a room with a set of concentric circles, some planks, some rocks, these small paper boxes that lie around in the shelves, and a platform to walk up on. The player would then have to build a catapult setup from the planks, put a box on one end, and drop a rock on the other, trying to hit the center circle