Codes
     Unlock  new  tanks  in  challenge  mode  (JP version). Inside the
church,  input  the following codes: (R/L mean the right/left shoulder
buttons)

Unlock a female slime tank
     Y, R, R, U, L, L, Y, Down, Down, Down, Y, Select

Unlock helmet slime tank
     Y, L, L, Y, R, R, Y, Up, Down, Select

Unlockables
     Unlock  new  tanks  for multi-card play. If you're in the church,
punch  down  these  buttons.  (Unlocking these wouldn't hurt since you
can't get these in regular battles, plus it'd be more fun :D)

Knightro                Y, L, L, Y, R, R, Y, Up, Down, Select
The Nemesis             Y, R, R, up, L, L, Y, Down, Down, Down, Y, Select