Geoff Crammond, creator of video game titles such as Aviator, Revs and Stunt Car Racer talks about how he devised and developed the groundbreaking 'The Sentinel' for the BBC Micro. 'The Sentinel' took games to another level and at the time was (and largely still is today) looked on as one of the most original and pioneering games of all time. Starting in a low area of a 3D world, you look up and observe The Sentinel who slowly turns looking for anyone or anything to absorb that is beneath it. Your only goal is to find some higher ground while staying out of sight and absorb him. This game featured remarkable 3D graphics and incredible atmosphere on what was only a 32k machine.