Halo: Combat Evolved

Halo: Combat Evolved is a 2001 first person shooter devolved by Bungie and published by Microsoft Game Studios. It was released on November 15, 2001, for the Xbox. On September 30, 2003, Gearbox Software ported the game for PC.

Halo: Custom Edition
Halo: Custom Edition is a free add-on to Halo: PC that allows users to create and modify maps.