Up, Down, Left, Right, I, II, Run
Alternate sprites
At the title screen hold Up + Button I + Button II and press Run
Black and White Mode
Hold Up, Select, and I, and then press Run
Extra continue
At the title screen press and hold Up, Select and 2, then press Run.
Start with the HP Bottle
At the title screen press and hold Up, Select and 1, then press Run.
Start with the Lamp