Retro Studios has been hard to work with Metrop Prime 4 since development was demolished and renewed last year, but there was a long time when the talented team seemed to be working on the Legend of Zelda game Starring Sheik, as well as the Super Mario game about the vicious ghost, Boo.
According to Shinesparkers, the concept art of both these rumored projects is now online. Links to the site that Metroid lovers found reportedly point to an online portfolio by Sammy Hall – a classic Retro Studios artist known for helping with the Nintendo Wii titles Metroid Prime 3: Fake
The work of art is said to be pre-production from the "canceled Zelda" project that was placed somewhere between 2005 and 2008, and the project "Cancel Boo" during the period 2006 to 2007. Details about the Bioo game are limited. Hall entitled one of the cartoons as "little things with little manageable solutions" – suggesting that the game was originally planned for the Nintendo DS. Some of the art of the Bioo concept was called "administrative power and the Broomies" and has a map of the world map.
The Zelda project was supposed to aim to be "ten times harder" than the average entry. Had the game been down, that story would have been placed within a "bad ending" Zelda History: Ocarina of Time
Below is a look at some of the concept art from these games. If you want to see more, go to Sammy Hall's profile on ArtStation: