XEvil is a free Open Source side-scrolling computer game developed by Steve Hardt at M.I.T. The game is a free-for-all deathmatch that pits any player against another player or a computer player. Released under the GNU GPL license, XEvil is free (as in freedom) software.
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. The game requires moving through levels randomly generated from a math algorithm, which complicates the levels, yet still makes it possible to complete the level using elevators or ladders. The game also has a "Kill-Kill"-Mode, which is an option to make the game harder. The game's only real objective is to survive, and can be played in either a single player or multiplayer mode.
Source code for XEvil is included (named xevilsrc2.02r2.zip)