By technique.
Sprite multiplexing, smooth scrolling, collision, attribute handling — the techniques that recur across machines, gathered in one place.
Coming as content is tagged
This cut draws on technique tags across units, patterns and vault entries. As those are tagged, this page will pull together every lesson and pattern that teaches a given trick — so you can see how, say, scrolling is solved on the Spectrum, the C64 and the Amiga at once.