Unreleased Chip's Challenge NES Prototype

We all know that Chip's Challenge is a brilliant puzzler that was made famous --mainly-- on the Atari Lynx; what Retro Collect just taught us though is that Chip's Challenge almost made it to the Nintendo Entertainment System too complete with new graphics and everything. And here, listed on eBay, is the unreleased Chip's Challenge NES Prototype to prove this. It's an EPROM card with  the game's demo code and it's as rare a NES rarity as it could get.

Seller ships worldwide.