"The game plays similarly to Wolfenstein 3D, but the graphics were changed to reflect a non-violent theme. Instead of killing Nazi soldiers in a castle, the player takes the part of Noah, wandering the Ark, using a slingshot to shoot sleep-inducing food at angry attacking animals, mostly goats, in order to render them unconscious."
http://en.wikipedia.org/wiki/Super_3D_Noah's_Ark
I have the SNES version on a cartridge and it resells for as high as $300 CAD.