'Hellfire Saga' (2023) by Red Miso Studios (Hack)
A ‘Castlevania’ and ‘Ghosts ‘n’Goblins’ styled hack of ‘Sonic 3 & Knuckles′ game with 10 acts and 15 mini-bosses.
https://sonicfangameshq.com/forums/showcase/hellfire-saga-grand-finale.1574/
'Sonic Speedway' (2021) by PotatoVampire7797 (Demo)
What's this? A Sonic game in 'Roblox'? It's true!
https://www.roblox.com/games/6184755490/Sonic-Speedway
'Kate the Wolf' (2021) by @MainMemory_ (SA2 Mod)
Brings her original character into 'Sonic Adventure 2'. She can explode robots from afar!
https://shc.zone/entries/expo2021/571
'Sonic 1 Definitive' (2021) by RadiantNexus Team (Hack)
Reimagines 'Sonic 1' by rearranging levels. remixing music, and inspirations from the 8-bit incarnation.
https://shc.zone/entries/contest2021/552
'Meander Land' (2023) by WhiskerMidi (Original Game)
Inspired by 'Super Mario Land' graphics!
https://www.sonicfangameshq.com/forums/showcase/meander-land.1698/
'Kirby's Halloween Adventure' (2021) by @Kirb_Star (Hack)
A spooky hack of 'Kirby's Adventure' with a ton of new characters and features.
https://www.sonicfangameshq.com/forums/showcase/kirbys-halloween-adventure-2020-2021-update.783/
'Mega Man X Synthesis' (2021) by Aspel The Blue (Demo)
Play as X and Zero!
https://www.sonicfangameshq.com/forums/showcase/mega-man-x-synthesis-sage-2021-demo.1115/
'STH2006 Project Demo 4' (2018) by brianuuu (Generations Mod)
Play through Kingdom Valley from 'Sonic 06', but with 'Sonic Generations'. The project plans to port all stages over.
https://www.youtube.com/watch?v=FyjvdwA8o4k&t=423s&ab_channel=brianuuuSonicReborn
'Cursed Hedgehogs 2: Ken the Penders' (2021) by @PkN0PE (SA2 Mod)
Gives Sonic, Shadow & Knuckles some Archie Sonic makeovers.
https://shc.zone/entries/expo2021/384