Hidden Palace Zone: Graphics and layout are the same as in the Nick Arcade prototype.Spring Yard Zone: Sonic the Hedgehog level.Casino Night Zone: Redesigned to look like the prototype level which had lots of pink.Star Light Zone: Sonic the Hedgehog level.Neo Green Hill Zone: Prototype name, and music.Labyrinth Zone: Sonic the Hedgehog level.Chemical Plant Zone: Small minor alterations were made, such as the loops having slanted corners as seen in prototype media.

Dust Hill Zone: Graphics similar to those featured in the mockup screenshot that was featured in many magazines.Wood Zone: The graphics are similar to what is seen in the Simon Wai prototype.Emerald Hill Zone: Prototype layout elements and Coconut monkey enemies are replaced with the scrapped Snail enemies.Green Hill Zone: Sonic the Hedgehog level.

The patch is in xdelta format due to shifted data resulting in IPS patches containing original code. The ROM is called Sonic the Hedgehog 2 (W) (REVSC02). The latest version is based off the revision 02 which was extracted from the Sonic Compilation for Sega Genesis. This is one of those hacks that simply must be played, its only flaws are the somewhat amateur-feeling level designs for the new zones and the fact it does not work on the real Genesis hardware. In addition to restoring cut zones, the hack adds a few new features: The ring counter now shows how many rings remain in a zone, the level select menu has been updated to allow access to the new zones, some Sonic 3 graphics have been ported, and even Knuckles has been ported from Sonic & Knuckles! Enemies from early revisions have also been restored The only zone that is incomplete in this hack is Genocide City, which is merely Chemical Plant with a different background and palette. Even Casino Night, which received a makeover since its beta state, has been restored to its former (very pink) look.

One zone, Dust Hill, was restored based on a single mock-up screenshot Winter Hill was based on an interview. While two of these zones (Wood and Hidden Palace) are available in the prototype ROM floating around the net, they’re in an unfinished and nearly unplayable state. The original zones, with a few exceptions, are untouched this hack restores zones that were cut during development. Sonic 2 Delta is one of those rare hacks that is actually better than the original game.

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