[wizzwizz4]

Couldn't you highlight each block being referred to as you mouse over / click on relevant text? (The latter might not be terribly hard to do with <a> and CSS :target, if you can give the blocks ids.)

[samwho]

The blocks aren't HTML elements, they're drawn on to a canvas. It _could_ be possible regardless, though. I may revisit this. Thanks for the idea! :)