Overscan (using the borders) was at the mercy of the monitor, so games often used 304 pixels to work everywhere, not even 320. That's 19 sprites per layer. Any

Overscan (using the borders) was at the mercy of the monitor, so games often used 304 pixels to work everywhere, not even 320. That's 19 sprites per layer. Any decent game would use at least two layers (38 sprites total in the general case, assuming no gaps or optimization schemes) or three (57 sprites). But then you'd probably need another column of sprites, partially clipped, for horizontal scrolling. Sounds like fun.