Perimeter

					
Unlock all levels
Make a directory called Profile0 in c:/Program Files/Codemasters/Perimeter/ResourceSaves
Now make a txt file with notepad called data. Do not give it a .txt extension. Just call it data with no extension. Put it in the Profile0 folder.
Now copy and paste this into the data file:
[General]

name=ABBYCHEAT

lastMissionNumber=28

difficulty=1
Save the file and run the game. All levels will be unlocked.