Released on June 2nd 2002 for the Game Boy Color, Shantae is the 2nd most expensive Game Boy Color game around. This is due to only 20-25,000 units being sold world wide, making it difficult to find.
Interesting facts about Shantae
-WayForward Technologies had difficulty finding a publisher for Shantae due to a massive 32 megabit battery needed for the cartridge to work properly and was expensive to make.
-Capcom finally picked up the game, but held off on publishing for months resulting in the game being released a year into the Game Boy Advance launch.
-As of this writing it is the 2nd most expensive game to obtain for Game Boy Color collectors, and can be hard to find due to its limited release of units.
Shantae on Wikipedia
Gameplay by World of Longplays via Youtube