Complete each of the five missions to unlock code letters. The five letters spell out a codename that allows access to your final mission. If you have what it takes to complete it, you’ll receive an exclusive reward and become an official member of our top-secret organization!
Notes
This game was re-released and renamed as “Operation S.T.A.R.T.U.P” later on, but several components were removed. They took out the original wood-panel game window, the hallway mission select, the operation brief switch, the tech gear switch, the bios for the kids, the idea of gathering the code for the final mission, and the final mission itself. This curation restores all of the content from the original launch.
Alt titles
Codename: Kids Next Door – Operation S.T.A.R.T.U.P. Launch Edition
Source
http://cartoonnetwork.com.au/asp/knd/main/index.asp