Enter these commnands on the in game keyboard:

CODE - RESULT            

DEBTINU     Up to 9 continues (can be selected)
TORAMAN     5 lives (can be selected)
KIKMAHP     Open all
BBCDTBC     Opens vs. CPU mode 1 (hidden)
DOAKSIM     Opens vs. CPU mode 2 (hidden)
STKZJGH     Opens vs. CPU mode 3 (hidden)
POQRTJC     Infinite continues (can be selected)