LakeFeperd

Sonic Chrono Adventure is the last in LakeFeperd's series of Sonic fangames made in Sonic Worlds, an engine built within Multimedia Fusion 2. It was developed at a time After The Sequel was feature-complete but also waiting for the sound team to finish composing their original soundtrack. Not wanting to exploit them, Lake went with existing songs for this final installment and released it in December 2013.

Overbound Game Studios

Sonic Time Twisted is an open-source Classic Sonic style fan-made game, headed by Overbound. The game tries to improve upon the best features from Sonic the Hedgehog CD and the other Genesis/Mega Drive games. These features including time travel, elemental shields, and 3D special stages. The player controls Sonic and co. and they play like they do in the Genesis titles. Like in Sonic the Hedgehog CD, the player must use time poles (now adjusted to be instant) to travel through two different time zones, Past and Future. In the Past, Sonic must find the Special Stages and collect the Time Stones, while in the Future, Sonic must also find the Special Stages, however, these have the Chaos Emeralds. Beat all 14 Special Stages in each time zone (7 each) and the player will achieve the True Ending. Besides that, the player must traverse through 8 zones, most with 2 acts each, reach the Goal Post at the end, as well as encounter a boss at the end of the stage be it Metal Sonic or one of many loyal Super Badniks.

ZykovEddy

Sonic the Hedgehog 3D is a free fan game about a famous SEGA mascot, Sonic, and it is made on Build Engine with additional EDuke 32 port. The game was inspired by two classic Sonic series: Mega Drive/Genesis and Sonic Adventure series.

«Sonic Game Land» is an unofficial fan-game featuring racing concept gameplay influenced by the titles like Sonic Rivals and Sonic Riders. Race with your opponents across four circuit-based zones to see who is faster.

Sonic 1 Sigma is a ROM hack of the original Sonic the Hedgehog for the Sega Genesis. This hack reimagines the 1991 classic with a focus on refined level design and expanded character abilities, effectively bridging the gap between the original game and its 16-bit sequels.