Piskvorky is simply a Portable Tic Tac Toe like game created by Lucersoft. Piskvorky also known as Gomoku is a two player (you against the computer) strategic game that works much like Tic Tac Toe, but with a slight twist.
TORCS is a highly Portable Free Car Racing Game also commonly referred to as "The Open Racing Car Simulator". This car racing simulation game allows you to race against opponents simulated by the computer or to develop your own driver bot and enter the driver into competitive events.
Warzone 2100 is a Free real time strategy game created by Pumpkin Studios and published by Eidos Interactive. This strategy style game offers single player, campaign, and online multiplayer skirmish modes.
Atomic Tanks Portable (Atanks) is an open source free portable battle game. Referred to as "a multi-platform Scorched Earth clone similar to the Worms series of games", Atomic Tanks is a game where you get to control a powerful tank.
Alien Arena is a Free online FPS first person shooter game that can be run from a portable USB device. takes a few of the best aspects featured in such popular games as Quake III and Unreal Tournament and then further combines them with unique and original ideas.