Sonic has made appearances in other games, sometimes as a playable character or sometimes just a cameo image.
Playable Sonic
Fighting Vipers (Arcade, 1995)
Christmas NiGHTS (Saturn, 1996)
Virtua Striker 3 (Arcade/GameCube, 2001)
Super Smash Bros Brawl (Wii, 2008)
Super Smash Bros for Wii U / 3DS (Wii U/3DS, 2014)
Super Mario Maker (Wii U, 2015)
LEGO Dimensions (PS4/Xbox One/Wii U, 2016)
Super Smash Bros Ultimate (Switch, 2018)
Super Monkey Ball Banana Blitz HD (Switch/Xbox One/PS4, 2019)
Super Monkey Ball Banana Mania (Xbox Series/PS5/Switch, 2021)
Wearable Sonic Costumes
LittleBigPlanet (PS3, 2009)
Mario Kart 8 (Wii U, 2014)
Yoshi’s Woolly World (Wii U, 2015)
Two Point Hospital (PC, 2018)
Olympic Games Tokyo 2020 – The Official Video Game (Xbox One/PS4, 2019)
Fall Guys: Ultimate Knockout (Xbox One/PS4, 2020)
Cameo Appearances
Sports Talk Baseball (Mega Drive, 1991)
Joe Montana II Sports Talk Football (Mega Drive, 1991)
Art Alive! (Mega Drive, 1991)
Ayrton Senna’s Super Monaco GP II (Mega Drive, 1992)
OutRunners (Mega Drive, 1992)
Sega Game Pack 4 in 1 (Game Gear, 1992)
Wally wo Sagase! (Mega Drive, 1992)
F1 (Master System, 1991)
Wimbledon Championship Tennis (Mega Drive, 1993)
Tom & Jerry: The Movie (Master System/Game Gear, 1993)
Ultimate Soccer (Mega Drive, 1993)
Crusader of Centy (Mega Drive, 1994)
Torarete Tamaruka!? (Game Gear, 1994)
Gale Racer (Saturn, 1994)
Bug! (Saturn, 1995)
Sega Saturn de Hakken!! Tamagotchi Park (Saturn, 1998)
SpikeOut (1998, Arcade)
Sega Bass Fishing (Dreamcast, 1999)
Phantasy Star Online (Dreamcast, 2000)
Segagaga (Dreamcast, 2001)
Virtua Cop 3 (Arcade, 2001)
Billy Hatcher and the Giant Egg (GameCube, 2003)
Phantasy Star Universe (PC, 2006)
Puyo Puyo! 15th Anniversary (Wii, 2006)
Sega Splash Golf (PC, 2008)
Taiko no Tatsujin (Mobile, 2008)
Samurai & Dragons (Vita, 2012)
Super Monkey Ball: Banana Splitz (Vita, 2012)
Puyo Puyo Tetris (PS3, 2013)
Monster Hunter 4 Ultimate (3DS, 2014)