Takahashi Meijin no Boukenjima IV
Review
Takahashi Meijin no Boukenjima IV, developed and published by Hudson Soft, is best known as the last Famicom game to ever be officially released, in 1994. Here we have a proto of Adventure Island IV, with a couple of screenshots from an auction.
As you can tell, the developers cut open a large, blue Famicom cartridge to fit the development chips inside. That’s a common practice with prototypes, especially seen with NES prototypes.
This proto was listed for sale at around $400, but it never sold for that much. Because the general release of Adventure Island IV is rare, this one would sell for more than most Famicom protos.
The Takahashi Meijin no Boukenjima IV prototype.