- At the main title, press and hold 2097 for 4 
  seconds. A hidden menu will appear in the 
  Gameplay selection it includes lots of stuff. 

- When you are at the menu where you get to 
  choose the level you wanna fight in One player
  games, press and hold omf for a couple of 
  seconds and keep pressing right and after a 
  couple of tries the level will change to macho,
  then deadly. 

- When fighting somebody, hold down the letters 
  BIG and press any mumber from 1-9 and that will
  change the ammount of scrap flying from the mech.
  Beware that this will slow down you computer. 

- Press and hold REIN when fighting a person and 
  scrap will start raining from the sky. 

- Fight in heavy metal level in tournament mode and
  you'll get to fight Jazz Jack Rabbit, Iceman, lots
  of people and get enhancements like tripple 
  concussion cannon with jaguar and 5-hit corscrew 
  blade.