Cheats for "Halo: Combat Evolved" for PC include: cheat_medusa 1 for instant death of the enemies that see the player; cheat_deathless_player 1 for invincibility; cheat_bump_possession 1 to possess the touched character; cheat_all_powerups to spawn all powerups; and cheat_all_vehicles to spawn all vehicles. Other cheats include" cheat_all_weapons to spawn all weapons; cheat_super_jump 1 to perform a super jump; and cheat_bottomless_clip 1 for unlimited ammo with no reload.
These cheats only work for the custom edition of "Halo: Combat Evolved" with the devmode enabled. The cheats do not work in online games. To enable devmode on the console, right click on the game's shortcut, click on properties and add "-console-devmode" after the target address. Start the game with the "-console-devmode" parameters. Enter the cheats in the console window during gameplay by pressing the tilde key.
To set the game speed, type "game_speed" in the console window followed by a space and a number between zero and 20, depending on the desired speed. The cheat to spawn a warthog is cheat_spawn_warthog and cheat_teleport_to_camera teleports the player to the current camera position. To quit the game, type "quit" into the console window and hit Enter. Clear the console window by typing "cls" inside it and pressing the Enter key.