Sonic Beyond the Speed

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 Robo Blast is an early Sonic fan game from 1998, created by Sonikku, real name Johnny Wallbank, of Sonic Team Junior. It is one of the earliest Sonic fangames to exist and led to the founding of Sonic Team Junior as well as the eventual creation of it's sequel, Sonic Robo Blast 2.

Sonic and his friends found out about the Cyberspace and its inhabitants, and Robotnik is using this world to create his empire, now everyone has to try to save the Cyberspace with the power of the Cyber Emeralds. Project 32X is a fan game that attempts to revive the original Sonic Mars/Sonic 32X project.

Sonic & Blaze is a 2D fangame inspired by the Sonic Rush series and the 3D Boost games.

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.

Sonic Overture '95 is a fan-made prequel to the first Sonic the Hedgehog, inspired by 32-bit games from the Saturn era and the scraped concepts from the original Sonic the Hedgehog. It tells the story of Sonic's adventures on Christmas Island. The game is an unofficial revival of the game known as Sonic Overture, which had a demo released in 2014.

Neo Sonic Universe is an action game developed and published by Alexandre Martins in 2003.

Two months after Sonic, Tails, and Knuckles' adventure in Sonic Universe 1, Robotinik returns. He calls Shadow to help him, but Shadow doesn't accept because he lost badly two months ago... Robotinik doesn't like it and leaves. So Shadow turns good and tries to support Sonic & co. against Robotinik (again!!). Now Robotinik is back stronger than ever! He takes the Master Emerald and leaves! Help Sonic & Friends get the Master Emerald back!

This game is an experimental 3D platformer with weird references and other random stuff.