Spriggan Mark 2

Level select:
Press Up, Up, Down five times, I, I, Run when the phrase "Push Run Button" appears on the title screen. Then, highlight "Option", hold Left and press Run.

Level skip:
Pause the game during a play. Press [Right, Left] four times, I five times, II. Resume game play and press I + II + Left + Select.

Control friendly character:
Plug in a second controller when a friendly character appears and press Run + Select.

Faster scrolling:
Pause the game during a play. Press I fifteen times, II. Resume game play and hold I to scroll faster.

Full shield:
Pause the game during a play. Press II, Select, Right, Select, Down, Select, I, I. Note: This code may only be enabled once per game.

Split screen mode:
Pause the game during a play. Press I three times, Up three times, Select three times.