Level select: Press Up/Right + Run at the title screen.
Then, hold Select and press Right three times, Up
three times, Left, Left, Down, II
within approximately four seconds.
More monsters: Hold Up/Right + II and press Run
at the title screen. Keep the buttons held until the "Normal
/ Vs" screen appears. A different scream will confirm correct
code entry. Then, quickly hold Select and press Right,
Left, Right, Left, Right, Left,
Up, Down, Up, Down, Up, Down,
Right, II.
All monsters: Hold Up/Left + I + II on controller
one and Down/Right + Select + Run on controller
two at the title screen.
Alternately, highlight "Vs Mode" at the mode selection
screen, then hold Up/Right + Select + Run
on controller two + Down/Left + II on controller
one. With those buttons held, hold I on controller I.
Monster select (player two): Press Up/Right + Run at the title screen.
Then, hold Select and press Right, Left,
Right, Left, Right, Left, Up,
Down, Up, Down, Right, II within
approximately four seconds.
High speed mode: Press Up/Right + Run at the title screen.
Then, hold Select and press Up, Right, Up,
Right, Up, Right, II within approximately
four seconds.
Alternately, hold Up/Right + II and press Run
at the title screen. Keep the buttons held until the "Normal
/ Vs" screen appears. A different scream will confirm correct
code entry. Then, quickly hold Select and press press Up,
Right, Up, Right, Up.
Unlimited specials: Hold Up/Right + II and press Run
at the title screen. Keep the buttons held until the "Normal
/ Vs" screen appears. A different scream will confirm correct
code entry. Then, quickly hold Select and press Down,
II, Down, Up, Down, II, Down,
Up, II. An "X" will appear at the top-right
of the screen to confirm correct code entry.