Famicom prototype Parody World: Monster has shown up on Ebay, and bidding has been furious.
While Monster Party was originally released in 1989 by Bandai for the US market, the original Japanese version developed by Shinsei never saw a release. Until now, only one prototype has seen the light of day, when it was sold at auction in May of 2011 for $6000. What made the original auction more intesting/frustrating for gamers, is that the Japanese owner promised never to release any ROMS, and that he would take the game to his deathbed.
However, a second copy has now been found and will hopefully convince someone to rip this game for historical preservation (and maybe we’ll get to play it too). The auction is currently up to $2575.07, as of time of writing, and there is still a 34 hours to go.
If you want to know more on the topic, I suggest you take a look at The Gaming Historian’s video on the subject: