Let's review the TIA Timing diagram from last time:   We used that to determine when we could safely update the playfield data in order to draw the score and timer. For moveable objects(player0, player1, missile0, missile1 and ball) if you update their graphics during the Visible Screen (cycles 23-76) you run the risk of shearing. For something that's moving fast, like the snowball in Stay Frosty 2, shearing may be an acceptable design compromise:   That snowball