VVVVVV is a 2D puzzle platform video game, built using Adobe Flash for Microsoft Windows and Mac OS. Featuring a gravity flipping game mechanic, the game was developed by Terry Cavanagh and was released in 2010 alongside an online demo.
-from Wikipedia's article on VVVVVV
This game is great. At only $5, it's quite the fun game that you can play for hours. Personally, I beat it in 2 hours with 1500+ deaths, but the challenge modes make you want to come back for more. Basically, you are in a regular old 2d platformer in space, however, there is no jump mechanism; all you can do is switch gravity. It sounds easy, but once you get into it they develop harder tricks and.. well, you'll see. It also features a quite nice soundtrack; just go on youtube and search 'VVVVVV Soundtrack', and you can find pretty much every one. My favorite's "Potential for Anything". :)
HERE'S A LINK to the demo. (click)
Challenge modes include: flip mode (everything is flipped upside down), no death mode (you cannot die), time trials (self explanatory), etc. They're quite challenging.
Do you have/play this game? Discuss.
also: i know this is a lil old but i didn't see a topic on it and decided it was worth it