Sonic Time Twisted is a classic style fan game developed by Overbound which is based on Sonic CD. The player can time travel between the future and past. You can play as Sonic, Tails, and Knuckles. Sonic Time Twisted features original and an original soundtrack which was produced by Hinchy.
Neo Sonic Universe is an advance styled fan game developed by Alexandre Martins, who is also known as @lex. The fan game features five playable characters; Sonic, Tails, Knuckles, Amy, and Shadow. The goal of the game is to save Sonic’s friends, collect all seven chaos emeralds, and defeat Evil Tempest.
Sonic Worlds is a Sonic game development engine for Multimedia Fusion 2 and Clickteam Fusion 2.5 which is a community project. Sonic Worlds is an accurate replication of the gameplay seen in the Sonic the Hedgehog games released for the SEGA Genesis. Popular fan games such as Sonic Before the Sequel and Sonic After the Sequel use Sonic Worlds. An update was released in October 2016 dubbed “The Accuracy Update” with improved physics and features.