Retro Studios was once working on a Portal-esque first-person puzzle game called Adept for the GameCube.
The studio began work on the game after Metroid Prime 3 and had a working prototype built in that game’s engine, but Nintendo said no.
Until now, footage of the prototype hadn’t been made public, but a new video from YouTube channel DidYouKnowGaming has revealed Adept – as well as fresh details on other cancelled games by Retro Studios.
