Retro Sonic

Pikuniku is a puzzle and adventure game set in a colorful world. The player controls Piku, a small red creature, guiding him through levels and solving puzzles that mostly involve kicking and pushing objects onto switches to open the way forward. Piku can lasso his legs to swing from hooks and zip lines, curl into a ball to roll, ride minecarts, and travel through pipes to reach new areas. Along the way the player meets villagers to talk with and can spend coins earned in levels on items such as hats. A local co-op mode lets a second player control a similar orange creature named Niku across a set of cooperative levels.

Sonic Souls is a Fan made creation, its been made with Unreal Development Kit (UDK).

Sonic Outbound is a Sonic fan-game set one year after Sonic Mania's bad ending where Robotnik had the Phantom Ruby and Chaos Emeralds in possession. After the final battle in the core of the Titanic Monarch, Robotnik was stuck in Little Planet and started collecting the Time Stones and preparing his greatest plan yet.

A 2D Sonic the Hedgehog fangame made with Clickteam Fusion

The world is a chaotic, terrifying place, rife with all manner of monsters, warlords and hostile architecture. Even for the mighty Pachacamac clan, just the act of survival is a day to day struggle, and everybody seems to know that they can't keep it up forever. In pursuit of a safe home, a lone shaman named Ichima happens apon the Special Stage - and with it, a means of realizing their dreams of safety and peace...

Sonic Hexacide is a Sonic fangame developed by DJ Coco using concepts based on the design of Sonic Lost World. The levels are built in a tubular 3D design, and the graphics are made of 2D sprites.

Crackle Cradle is a 2D sidescrolling platformer/shooter developed by FoxTail. This game entails guiding the selected heroine through various areas, traps, and monsters, relying on a mixture of evasive skills and accuracy with their weapons.

Sonic Freedom is a 2D hand drawn platformer developed by tripplejaz and marmitoTH in Unity. The sonic fan game wants to bring Sonic into the modern era of platformers with a faithful recreation of momentum based gameplay, drawing on mechanical and level design inspiration from recent metroidvania titles like “Hollow Knight” and “Ori and the Blind Forest,” coupled with an aesthetic grounded in 90s anime as seen in the Sonic CD Toei animations and the “Sonic the Hedgehog” OVA.

A challenging puzzle platformer inspired by games like Limbo and Badland.

Sonic: After the Sequel (abbreviated Sonic ATS), is a fan game created by LakeFeperd that is meant to explain the events that may have taken place between Sonic the Hedgehog 2 and Sonic 3 and Knuckles. In it, the player plays as Sonic and Tails, racing through numerous zones as Sonic and Tails go out to stop Dr. Eggman from crashing the Death Egg into (and attacking), the new, mysterious island known as Angel Island. It is the sequel to Sonic Before the Sequel.