Zombie Nation Game System: Nintendo System Cheat Category: Cheat Game Company: Unknown Game Category: Unknown Hint, Cheat, Walkthrough:   Zombie Nation ============= =>Energy Refill: Pause the game and press U U D D L R L R B A START. This can be done once per game. =>Sound Test: Hold U+A+B and press RESET. ---------------------------------------------------------------------- This game aid is used with kind permission of David F. Dayton from David Dayton's Nintendo Codebook Version 4.5 Download the latest version from: http://codebook.stals.com