Perfect Dark Cheats

The Combat Simulator has several Game Presets (modes that have already been created by Rare) that are available from the beginning, but some of the best you must unlock by beating a certain amount of Challenges. Which challenges you beat doesn't really matter, as long as you have the set total needed to unlock the Preset. Of course, you can alter these Presets just to how you like them :)

Upon going to Combat Simulator from the main menu, select Challenges. Perfect Dark has a total of 30 challenges, and upon beating them you will unlock certain items/areas for the Combat Simulator (multiplayer mode). In order to unlock all the arenas in the Combat Simulator, you must beat a certain number of challenges (which challenges you beat doesn't really matter).

Get an N64 Perfect Dark game, a Transfer Pak, and a Game Boy Color Perfect Dark game. Plug the Transfer Pak into the back of your controller, put the GBC game in the Transfer Pak's slot, and turn the N64's power ON. You will now have the following cheats:

These will change the ally (and its weapon) on Co-Op IF it is a simulant.