know any movies similar to Saw and Cube?

There's a film that came out fairly recently called Waz (UK title) The Killing Gene (US title)

That film is VERY identical to the Saw series. Main difference is it's far more intelligent and boosts some very dramatic performances, notably from a revelation that is Selma Blair. Stellan Skargaard is excellent too, but Selma Blair dominates. It's just very hard to watch though as some scenes are really grisly and the whole film just makes you feel so miserable. It's worth checking out.