This week I received a complete copy of Surf Ninja's for the Game Gear in European box with 8 language manual.
As the game came from Hong Kong and no other complete copies ever showed up, I wouldn't be surprised if the game was never shipped to Europe. The only info I can find on the web is that anagrama mentioned a copy for sale in Taiwan nine years ago.
Some Game Gear collector's say they see it as prototype. Personally I don't think it is, and I think there are more copies around in Hong Kong, Taiwan and maybe other Asian countries, but they never show up because the language barrier.
if anybody here has opinions please let me know. A full set of images is available at smspower.org.