Retro Studios was once working on a Portal-esque first-person puzzle game called Adept.
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.
Adept was a first-person puzzle game similar to Valve’s Portal, except the player could utilise cylinders rather than portals. These cylinders had varying properties, like teleportation, force push, or different elements. Rather than just two portals, players could fire as many cylinders as they liked, which would add to the game’s combat as well as puzzle solving.