Thanks for that. It's either cos i went over 4 mb, or because the save game changed, or perhaps both :) I'll try to fix this with the next release. I don't think it'll quite work on real hardware just yet, so don't worry about that. Just some remaining z80 / 68000 contention to fix.
A few months ago I was diving into unreleased prototypes and I played a bit of both games. On Waterworld, someone released a rom hack: https://www.romhacking.net/hacks/6644/. Wacky Races and I go WAY back, and I believe that you captured the look and feel of the cartoon. The music is awesome too. It seemed so close to finished, and way better than most cart racers. How close was it to it's final form?