A cancelled Game Boy Color prototype of the first Densetsu no Stafy title. It was cancelled due to the release of the Game Boy Advance. Densetsu no Stafy (Densetsu no Sutafī – “Legendary Stafy”) is a video game series developed by TOSE and published by Nintendo. The genre of the series is a special kind of platform game called “marine platform”, due to the game being more about swimming than running and jumping around. The series is the only franchise that TOSE owns the copyright for, although Nintendo owns the copyright as well. It was released in 2002 with Densetsu no Stafy for the Game Boy Advance, and was then followed up by three sequels: Densetsu no Stafy 2 for GBA in 2003, Densetsu no Stafy 3 for GBA in 2004 and Densetsu no Stafy 4 for Nintendo DS in 2006. – [info from Wikipedia]
You can find more info on the GBC version in the Starfy Wiki!
Thanks to pippitypop for the contribution!
Space World 2000 Trailer: