Toribash is, simply, awesome. You need no knowledge, you work in bullet-time, deciding which limbs to bend or stiffen, and see a second-by-second preview of what each change would do. String them together, build jaw-dropping martial arts attacks.
The build quality’s poor (no docs, no installer, poor handling for savefiles, etc) – but it’s great fun, and easy enough to understand with just a little clicking around. Play it now!