This is a hack that fixes the names of the levels on the Level Select Screen of the Early (Nick Arcade) Sonic 2 prototype. This prototype was so early that the level select screen was exactly the same as Sonic 1. This changes the names of the levels shown to what levels they actually lead to.
To enter the Level select menu on this prototype you need to press Up, Down, Down, Down, Down, Up, the hold A+Start at the Title screen.
File Name: Sonic_The_Hedgehog_2_(Early_prototype)_(dumped_by_hidden-palace.org).bin
CRC32: 39faaa70
MD5: a460bf633579a80eebbc09d6809e1b09
SHA-1: 5b51b4d98cb4a7a38157dc4ab9462164dd224bfd
SHA-256: 2d04fd2ef3dacbeaf2c8ef03a4cc614020dace9f519b4db95029b20328210349