As well as excitement, there was palpable trepidation when Nintendo announced that Metroid was going not only 3D, but also first-person - especially because it was being developed in tandem with an untested American team, Retro Studios. However, the resulting game - Metroid Prime - was received with almost universal praise. Leon, Brian, Karl and community correspondents recall the immersion and the atmosphere of Samus Aran's first in-helmet outing, as well as analysing how its gameplay holds up, 20 years on.