Resident Evil 4 Cheats Cheats, Secrets and Unlockables Assignment Ada - To unlock this game mode where you play as Ada in a short mission, you must first beat the main story. Resident Evil 4 GameCube Cheats v.0 30 Aug 2005 by Various Resident Evil 4 FAQ v.0.91 25 Jan 2005 by Heath Lynch Resident Evil FAQ Walkthrough v.2.03 13 Jan 2005 by Staley. Apr 30, 2002 For Resident Evil on the GameCube, GameFAQs has 10 cheat codes and secrets.