I had a few hours of spare time and, based on my old disassembly from 2001, created a little hack of Pitfall!. This hack allows you to select one of 16 all new maze variations. Especially for those who have still fun in mapping screens and underground passages. Enjoy!
NTSC and PAL-60 (with some small color adjustments) versions included.
Update: The x256 version has 256 mazes and additional variety of the existing game elements. See this post for details.