Sticky bit

The "sticky bit" is one of the per-sprite attributes stored in the Sprite Control Bank 3 (bit 6).

Setting it to 1 makes the corresponding sprite "stick" to the precedent one.

The video hardware will automatically place it 16 to the left of the precedent sprite, use the same Y position, size and vertical shrinking coefficient. Only the horizontal shrinking coefficient is left independant.

Sticky sprites can also be called "driven sprites".