I just found a "Version Espanola" of Mach Rider in my local game store, and it kind of blew my little world...
I had found some Canadian variants there, but I wasn't aware that there were even Spanish versions of NES games. Anyone care to shed a little more light on them? (How many are there? Value? Etc).

Voila, the database is your friend These are all the currently documented ESP games

http://www.nintendoage.com/index.cfm?StartRow=1&FuseActi...

Ah, thanks. Didn't know the Database covered ESP. Good to know.

However, in stranger developments, the game isn't Mach Rider in Spanish as claimed on the label, but rather an English version of Paperboy...weird.