Altered Beast Continue game
After losing a life, hold X and tap Start until restarting at the last game location played.
Options menu
At the title screen, hold A and press Start to display an options menu.
Level select
Enable the "Options menu" code. Select a level from the options menu and hold X + Start at the title screen to begin a game at that location.
Beast select
At the title screen, hold X + A + B + Down/Left and press Start. A menu that allows selection of the beast for each round will appear. Use the D-pad to change beasts and Start to exit the menu.
Sound test
At the title screen, hold X + B + Up/Right and press Start.
Interactive credits
The credits will appear after Athena is rescued. Punch or Kick the credits to force them to scroll downward.
Two-player mode
Press Start on controller two to begin game play.
Higher jumps
While jumping, hold Up.
Defeating the second Boss
When Nelf turns into the big eye, get close to the middle of the eye when he is still in smoke form. Then use the electricity attack and he will die instantly. Note: You may still get hit while attacking. This trick is easier with a controller with a turbo feature.
Defeating the final Boss
When you get to the Boss, duck and shoot your fireball. This works quickly and is effective. This is easy, because he uses his arms more than his legs -- he will only kick with about one in every ten punches. Note: You will still get hit -- jump back and forth if needed.
Sites: