First Fantasy Zero is a currently-unfinished role-playing game currently on hiatus but still in the works. In 2016 a CE Textlib version pushed that ASM lib almost to its absolute limits and in 2023 a new version, this time using Celtic CE pushes the rectangle command to its limits, as the game engine's code predates the addition of proper sprite support to Celtic CE. Enjoy those two demos while they last, because you can almost just explore.