VVVVVV is a platformer game released by Terry Cavanagh in 2010, based around a single simple idea–what if, instead of jumping, you could reverse gravity? The plot of the game is that a crew of five people has some kind of accident that leaves it stuck, and with the screw scattered across the area when there’s a transporter problem. You are the captain and it’s your responsibility to find your crew members and return them to the ship so you can leave again. You can flip gravity–the reason for this is not explained, but none of the other crew members seem to be able to do it, some captain’s privilege I guess. The one restriction is that to flip it , you have to have your feet on a solid surface–you can’t flip back and forth in mid-air, you have to wait until you land.