This is a list of computer games that do not require any kind of formal "installation" onto a computer's permanent storage device to be executed, and can be stored on a removable storage such as a USB flash drive and used on multiple computers. See also portable applications.
Battle for Wesnoth - A turn-based strategy game where the objective is to gather and train new recruits into specialied and skilled warriors in order to eventually regain the throne of Wesnoth.
Cave Story (Doukutsu Monogatari) - A Japanese freeware PC side-scrolling platformer game developed by StudioPixel.
Crimson Fields - An open-source, tactical game based on the popular game Battle Isle where the player decides where and when to send their units in support of a variety of mission objectives.
Transcendence - As pilot, the player flies throughout the galaxy encountering pirates, outlaws, and slaves, strange alien life-forms, and other creatures that mean the player well or ill.
Vega Strike - A 3D futuristic space based game the player, a merchant, travels across a dynamic galaxy trying to make the most profit possible given certain limitations.
Cube - Single and multi-player shooter which includes over 100 detailed original maps, level editing functionality, and various other items and features.
Cube 2: Sauerbraten - single and multi-player shooter which includes over 100 detailed original maps, level editing functionality, and various other items and features.
Tremulous - As part of one of two races (either human or alien) the player works with their other team members to attack and destroy the other team along with their means to respawn in this 3D game.
War§ow - 3D game based on Qfusion with cartoon-like visuals and various player modes
XEvil - XEvil is a third person 2-D side scrolling game. The game is based on moving through randomly generated levels that force the player to attack enemies with one of several randomly chosen characters.
Marathon Trilogy - An early, doom-era shooter with sci-fi plot-driven storyline and online multiplayer and LAN support.
Call of Duty 1 - A world war 1 game and can be played portably.