Time Paradox gives you a maze, a locked exit, a bunch of keys, some of which are hidden behind other locked doors, and a button that rewinds time. When you step on the latter, it rewinds back to the start of the level and replays your previous actions. But your first character remains under your control, kinda like the shadow levels in Braid.
The catch is: you only have thirty seconds to make it to the exit, with the clock resetting when you rewind time. So much of the puzzling is working out how to retrieve multiple keys with multiple characters and doing so quickly.
Oh, and the other catch is: if your character sees your shadow, the resulting titular time paradox ends your life. Harsh.
Time Paradox [Square Enix]