When I was a kid, I made my own Tron boardgame... it wasn't based on the videogame, but it did have a lot of the elements. I hadn't actually seen the movie or game at that point, but I had the "official magazine" and had an idea what it was about. So I cut up the mag to use as parts and made the game. It had a lightcycle arena in the middle, tanks and a recognizer that would patrol the corridors, and hidden items including the discs and lightcycles. You had to locate your disc while avoiding tanks and recognizers and escape the computer with the disc, and you could use your disc to attack other players or try to break through a lightcycle wall. My friends and I played it a ton, and it was quite fun... I wish I still had it.
Once I actually saw the movie, I made a followup game and it sucked. The first time I was concentrating on making a good game with the flavor of the movie, whereas the second time I was trying to shoehorn the movie into the game. Big difference, and a big lesson learned.
--Chris