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/Thick (Nintendo 64 style)
Explosion Fragments - Normal/None/Heavy
Background - Normal/None/?
Invincibility - On/Off
