'Sonic Totem' (2021) by @SonicTotemGame (Demo)
Three whole acts are available in this demo, check it out!
https://www.sonicfangameshq.com/forums/showcase/sonic-totem-sage-21-demo.957/

'Sonic 1 SMS Remake' (2019) by Creative Araya
A widescreen recreation with new stages, unlockable characters, and can be played on mobile!
https://sonic-sms-remake.blogspot.com/p/one.html

'Silver Sonic The Crystal Islands Refreshed!' (2024) by Roebloz (Hack)
An expanded and cleaned up version of this Master System hack featuring Silver Sonic.
https://shc.zone/entries/contest2024/1060

'Sonic 2: Rise of Mephiles' (2021) by Full Sawfish (Demo)
https://sonicfangameshq.com/forums/showcase/sonic-the-hedgehog-2-rise-of-mephiles.938/

'Inifnity Girl' (2024) by DevDad3030 (Original Demo)
A high-speed rhythm roguelike
#NonSonicWeekend
https://sonicfangameshq.com/forums/showcase/infinity-girl-a-high-speed-rhythm-roguelike-with-a-big-7-level-demo.2264/

'Nights Adventure' (1999) by Ryan Langley (@Rlan2)
#NonSonicWeekend
https://archive.org/details/nightsadventure

'Super Infiniboss: The Gauntlet' (2024) by happygreenfairy (Original Demo)
An endless boss battle arcade platformer. It's about you, an ever-changing boss, and tons of projectiles.
#NonSonicWeekend
https://sonicfangameshq.com/forums/showcase/super-infiniboss-the-gauntlet-sage-2024-demo.2232/

'Megaman X Omega Blaster - Definitive Edition' (2024) by Corrupião Lendário (Demo)
An Arcade/Arena style fangame inspired by the earlier MegaMan arcde games, but focused on the X sag.
#NonSonicWeekend
https://sonicfangameshq.com/forums/showcase/megaman-x-omega-blaster-definitive-edition.2042/

'Agent Stone' (2023) by HazelSpooder (S3Air Mod)
Agent Stone has became loyal to the evil Dr. Robotnik, and will do anything he can to assist him in repowering the Death Egg.
https://shc.zone/entries/contest2023/802

'Sonic Infinity+' (2020) by @SonicInfinity2 (Demo)
https://gamejolt.com/games/Sonic-InfinityPlus/440246