Sonic 2 Beta ROM vs. Final ROM - Casino Night Zone

Left: beta version, Right: final version

Beta lacks any objects, and has an entirely different set of graphics tiles.

Left: beta version, Right: final version

Conveyor belts don't work.

Both: beta version

Some areas consist of randomly-placed tiles. Only a few areas are remotely playable.

Left: beta version, Right: final version

Loops don't work, and they look crap too.

Act 2 is even more messed up, with random tiles all over the place.