Sprocket Rocket is apparently a game which is tied in to Wallace and Gromit, of all things.
It features educational content on inventions and patents, as well as physics-based puzzle gameplay and a very interesting dynamic design aspect.
You fly a little ship around, and you can create and modify a tool for it. Such as this:
This particular tool isn't practical or useful at all, but it's fun.
I'd recommend playing around with this game purely for its uniqueness and originality. You almost don't notice the Wallace and Gromit content, except for the occasional angry Wallace grunt as your little ship smacks around.
Don't worry about figuring it out-the game is self-explanatory.
Certainly, there are worse ways to burn a free hour.