World's rarest Baseball videogame?

Swing! Batter! Batter! Swing! Heeeeaaaaarrrrrrr the crowd! The jeering fans! The crack of the baaat!

Previously I mentioned the ultra rare Famicom Box version of Super Mario Bros. I will briefly highlight the details.

The Famicom Box is the Japanese hotel pay-per-play offering a certain amount of time console each session. The cartridges were black sporting a yellowish Mario and the name of the game is written in Japanese. Ironically enough, the label says Nintendo Entertainment System even though it is incompatible with the console. and would only play on the Famicom Box unless you found a way to use a converter adapter allowing it to work with the Famicom.
It will work with an NES-to-Famicom adapter but will not work with the NES unless the CIC pin 4 leg is cut or lifted (I don't condone modding consoles for the).

This cartridge is the rarest Baseball videogame in existence (well, maybe not to the extreme, but it is still unheard of by most people). It will work with an NES-to-Famicom adapter but will not work with the NES unless the CIC pin 4 leg is cut or lifted. I don't condone modding consoles unless you.

There isn't much else to say about this version of Baseball because it is exactly the same as retail as far as the game itself plays. If you are able to find a cartridge at a reasonable price then go for it! Chances are you won't and I got lucky and only paid 56 for mine.