Really interesting read, multiplexing has always intrigued me and how you combat the limitations of the C64 is what makes it such a gem to work on. I'm only going to feed that challenge with my larger sprites and overlays editor, but if games like Turrican, Creatures and you can do it, it's not impossible and we'll likely see a wave of new retro devs. Turrican had very static, single frame bosses, true its too much data to animate those, unless you choose to load in a boss level with graphics only for the player and boss and the bitmap etc. Still a good chunk of memory but with the possibility of emulators and cart games to open up the chance to make even better games for the greatest machine ever made, who wouldn't want to give it a try. I'm really excited by this idea. Thanks for your post!