This is the source code to my 2009 game It Only Takes A Second. This is a 2D-engine, 3D-graphics platformer, which was and still is a nifty little game in my opinion!
Other than a small puzzle element of the game (which I've disabled), all online stuff and nasty functions from GM8 that don't work in GM: Studio (deprecated in Studio, and none of it's important) and the fonts and music in the game (which I can't redistribute), this is the full game. By purchasing this, you're welcome to learn from the various pieces of the game, rip out pieces of code, or even just modify and add to the game willy nilly and release the results commercially!
If you want to play with the full game in .exe format before putting your cash down, you can download it free here: http://nalgames.com/games/it-only-takes-a-second/