But in this case, that (alone) can't be it because all 9 sprites clip (smoothly) in and out of the border. So they've really gotten cheeky with this one.
Re:Nine – seemingly impossible C64 demo
by egypturnash on Tuesday February 04, 2025 @08:39PM
(#42942370)
That stops working when you open the borders and put sprites outside the area the video chip will render characters/bitmaps.
Yes, but the demo is really cheeky about that.
The borders are open when you can still do the normal multiplexing, because there's lots of vertical separation between the sprites.
Later, when they put the sprites together on the same line, the borders are closed.
the secret is to pretend you have a 9th sprite by emulating it with characters that look exactly like one of the sprites would.