Basil T. had discovered a demo for Bignose & the Witchdoctor. The game seems to be a very early version of the released Bignose Freaks Out game. Only one level is playable, and there are only 25 bones in that stage. Very interesting piece of Nintendo history.

A few other things to mention about Bignose & the Witchdoctor. You start out with nine lives. If you die in a pit, you are forced to start the stage from the beginning. If you die by other means, Bignose turns invincible for a few seconds and you continue where you are.

Pictures (and information) thanks to Basil T.