Another new screenshot, this one shows the first rock:

It's the little yellow thing near the top. This was surprisingly difficult to do. I have the curling sheet laid out as one big memory block so that the bottom display can scroll along it. Each row is 85 bytes, so every row of the rock has to span that gap. I also had to account for rocks that could stride two consecutive bytes, which was a special kind of annoying.

I plan to add some kind of simple handle to the rock so you can watch it rotate during the throw. Might try to do that today at work during downtime.

Also, what is the deal with 6502 rotate instructions? They do a 9 bit rotation using the carry flag as a spillover. Very annoying, need to remember that behavior.