Bakuretsu Muteki Bangaioh Cheats (Dreamcast)

Enter 3 Groundhogs (found towards the end of the name entry list of characters) as a name
to unlock an extra menu at the options screen and 44 levels. The extra options are: 

  Riki's shot trail thickness: Normal (thin), Thick
  Mami's shot trails: Normal (thin), Thick, Large Missile and Thick (Nintendo 64 style)
  Explosion Fragments: Normal, None, Heavy
  Background: Normal, None, ?
  Invincibility: Off