BH mode is your friend.
It’s been discovered that Big Head Mode is in GoldenEye 007, even though developer Eurocom previously said it wouldn’t be included.
The classic cheat was found when a Kotaku reader went in to the main executable file of the game and digged out the tip codes, one of which contained the Big Head Mode.
The codes are:
NotIt!!!11 – Unlocks Tag in Multiplayer Split-Screen (see under Modifiers. Requires three or more players.)
Inv1s1bleEv3ryth1ng – Unlocks Invisibility Mode in Multiplayer Split-Screen (also under Modifiers. Invisibility is activated in lieu of sprint by holding B).
<477MYFR13NDS4R3SP13S> – This activates Big Head Mode in Local Multiplayer. There is no toggle in the local multiplayer modifiers, the only way to switch it off is to reset the defaults; the only way to switch it on is to re-enter the code.
Two other codes discovered in the Wii shooter is the abillity to be invisible in multiplayer and to unlock Tag in split-screen multiplayer.
Bam. More at the link.