Xbox 360: Free legally: Aegis Wing Dash of Destruction Hexic HD Totem Ball (has DRM so you would have needed to have downloaded it when it was on live) Yaris Free not legally: Serious Sam 1 and 2 have no DRM if extracted from the retail disc, and injected in to a USB flash drive, however both games are sold so would be piracy. Alien Breed Trilogy - same as Serious Sam, you can rip the files off the retial disc, inject them in to a memory stick and they play as full games. There are also a special version of Worms and Geometry wars that works as the full version from a memory card, not really free legally though unless you purchased the memory card with it on. I think that is everything that will work on a 360 not modded in any way.