Hardware detection triggers if any single non-transparent pixel of Sprite A touches a non-transparent pixel of Sprite B.
In the competitive modding scene, such as Smash Remix , these collision boxes are often tweaked for balance. For example: collision cb fighting 64
The C64’s VIC-II chip features built-in sprite-to-sprite and sprite-to-background collision registers ( D01Eandcap D 01 cap E a n d such as Smash Remix