Despite the limited success, Nintendo would press ahead with 3D development into the 1990s. Gunpei Yokoi, creator of the Game Boy handheld console and popular Metroid video game, developed a new 3D device for Nintendo called the Virtual Boy. It was a portable table-top system consisting of goggles and a controller that used a spinning disc to achieve full stereoscopic monochrome 3D. Released in 1995, the Virtual Boy sold fewer than a million units, spawning only 22 compatible game titles, and was widely considered to be a commercial failure. Shigeru Miyamoto, known for his work on popular game franchises such as Mario and The Legend of Zelda, commented in a 2011 interview that he felt conflicted about Yokoi's decision to use wire-frame models for 3D and suggested that the product may not have been marketed correctly. The failure of the Virtual Boy left many at Nintendo doubting the viability of 3D gaming. Despite this, Nintendo continued to investigate the incorporation of 3D technology into other products.