This topic is for the purpose of discussing #8480: nymx & DrD2k9's C64 Disc Blitz in 01:51.21

So it looks like this game was more interesting to TAS than I originally thought. During my initial effort, I did notice a lot of flashing...after shooting a disc. I never really put two and two together until DrD2k9 figured out what was going on. Basically, the Sprite Register is giving the indication that two or more objects are touching. The problem with this, is that the register can't communicate which two objects are touching. So the game's code has to scan and check each sprite in a logical order. So it doesn't necessarily mean that they are in order on the screen, but how the register detects them. This is a known problem with the Commodore 64, which is worked around by good coding. Because of the many games I've TASed for this computer, during this year, I have run across this problem a few times. For one...the glitch that I discovered in Stronghold helped me to clip through walls, only because the game was checking things in an order that ignored my ship's touching of other objects. So, I have made a valiant effort to re-optimize this game according to this new discovery. I have added to DrD2k9's 37 frames (from Level 1 only), increasing it to 74 frames total at the end of four waves on Level 5. I will replace the new movie, once DrD2k9 decides on reviewing privately first.