Sonic 2 Retro Remix is a large-scale ROM hack of Sonic the Hedgehog 2 for the Sega Mega Drive, created by Thorn and DNXDelta. The goal of the project is to create a 2D Sonic the Hedgehog game that requires exploration to progress, as well as the requisite platforming and sheer speed. A mission system akin to those of the 3D Super Mario games is implemented as the means of progressing from one level to the next. Missions involve earning Chaos Emeralds in scavenger hunts, boss battles, speed runs and score attacks; most require learning each level's ins and outs, instead of just finding the easiest way to the goal.
Sonic Boom is a total modification of Sonic 2, created by snkenjoi and iojnekns, along with a wide array of talented contributors. As of the Seventh Annual Hacking Contest, this collective is referred to as SÆGA.
Sonic the Hedgehog OmoChao Edition is a ROM hack of Sonic the Hedgehog (16-bit) by Cinossu.
Originally starting as a joke between himself and Qjimbo, later on becoming a joke hack as an idea for April Fools, with the addition of OmoChao it became a challenge-based (and playable) hack, where the objective is to collect, destroy or even touch as little as possible.
A ROM hack/mod for Sonic the Hedgehog which changes Sonic for Shadow the Hedgehog. Although a previous mod with the same purpose exists, this one adds new abilities like the Light Dash and removes the Homing Attack.
A ROM hack/mod for Sonic the Hedgehog which changes Sonic for Rouge the Bat. The new character has new abilities such as the glide and an aerial downward attack.
Nuclear Rush is an unreleased Sega Mega Drive tank combat game for use with the Sega VR headset, developed by FutureScape Productions and slated to be published by Sega. Intended to be the hardware’s pack-in game, it features gameplay similar to Battlezone and Stellar-Fire.
Sonic 1 Beta Remake is a Sonic 1 hack created by Mistergambit. The hack has all of the Sonic 1 levels redesigned to look like their prototype counterparts, as seen in various magazine screen shots. This hack also has new objects, such as a functioning Splats, the checkered ball that was scrapped from GHZ, and more. To make it seem more like a genuine prototype, some levels are made to look unfinished.
A multiplayer-only ROM hack of Sonic the Hedgehog.
Two players select a character (one being Sonic and the other being Tails) and both battle it out to try to gain as many hits on Eggman. The catch is that Eggman only gets destroyed when the timer runs down to 0 (unless it's a draw at that time, then, it will wait for another hit). The player with the most hits at the end of the timer wins. The player can also win if the other player dies before the timer runs out (if respawn mode is off).
Yeth is a ROM hack of Sonic the Hedgehog. The game features an original character by the name of Yeth as he adventures through several new levels (and one familiar one).
A ROM hack of Sonic the Hedgehog in which the main character replaced by Motobug, one of Dr. Robotnik's Badniks. The new protagonist has a much lower speed, unless when using power-ups.
A ROM hack for Sonic the Hedgehog which swaps Sonic for Big the Cat (from Sonic Adventure), with his moveset based on a previous mod from the same author, Sonic the Hedgehog 2: Pink Edition.
Air Hockey is a game for the Sega Genesis created by Devworks Game Technology. It's commonly included as a pre-installed game in the AtGames Sega Genesis Flashback systems.