This game comes from a request by wizzard to try and find games from the University of Illinois at Urbana-Champaign. It was also submitted to the igf for 2009.
QuantumS is an excellent time travel based stealth puzzle game. You have the ability to travel back in time and use your past selves to solve puzzles. You can do things like have a past self stand on a switch to keep a door open to the next room or distract guards so you can sneak past.
Website Description:
Timmy is a boy who has run away from home, and his wandering takes him to a ship where the rules of time don't always hold. Now, in order to escape from a ship full of unfriendly guards, Timmy must solve puzzles using time as a tool. Utilize previous selves and the fourth dimension to escape the ship!
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Unfortunately the official website has a problem with the download.
When I tried to download it, the download would reach 10MB and then it would just... die. lol. After trying a few times I eventually had to use a download manager to get it. So I uploaded it to mediafire, a free temporary file upload website, so you can download it without a download manager.
Official Website (Do not download without a download manager):
http://www.acm.uiuc.edu/gamebuilders/projects/quantums/
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Download (45MB):
http://www.mediafire.com/?sharekey=83c1199a59f4d2e400d27174b47c6657e04e75f6e8ebb871