I like to play all games, and once I beat them I like to try and make them my own (Mod). I also like to build on to of engines such as Source, GoldSource, Quake, Darkplaces, and engines made in Game Maker. I think that retro/old games are the best (eg Quake, Doom, Half Life, etc.).
Remakes of Doom and Quake are planned for the Impulse Engine, for free, of course.