Note: These only work for the Custom Edition of Halo: Combat Evolved.
Open the properties window of the Halo shortcut and add “ -console –devmode” after the target. Start the game with the -console -devmode command line parameter. Press ~ during game play to display the console window, then activate the following cheats by entering the corresponding codes:
CHEAT FUNCTION - CHEAT CODE Toggle instant deaths for enemies that see player - cheat_medusa <0 or 1> Set game speed - game_speed <0-20> Clear console window - cls Toggle unlimited ammunition and no overheating for human weapons and plasma weapons - cheat_bottomless_clip <0 or 1> Unlimited ammunition - cheat_infinite_ammo <0 or 1> Super jumps - cheat_super_jump <0 or 1> Possess touched character - cheat_bump_possession <0 or 1> Invincibility - cheat_deathless_player <0 or 1> Active camouflage until shot, quit, or level ends - cheat_active_camouflage Spawn Warthog - cheat_spawn_warthog Spawn all power-ups - cheat_all_powerups Spawn all vehicles - cheat_all_vehicles Spawn all weapons - cheat_all_weapons Teleport player to current camera position - cheat_teleport_to_camera Save current camera location - debug_camera_save Go to saved camera location, away from player - debug_camera_load List player names and numbers on server - sv_players Ban indicated player from server - sv_ban Kick indicated player from server - sv_kick Send message as **SERVER** user name [NOTE 1] - sv_say Quit game - quit
NOTE 1: Use the underscore character "_" in place of spaces in your message to separate words.