Atari 2600
I had an Atari 2600 at one point. Probably still do.
I made a complete map for the game Pitfall. Once you get good at the game, the main problem you have is the time limit. I wanted to know the shortest route to the most valuable treasures, hence the map. (Note: the source code for this is in the Postscript language, but few people have viewers for that, so I "compiled" it to PDF.)
pitfall.pdf