Is Sonic the Hedgehog on Steam?

No. Sonic the Hedgehog is not distributed on Steam, so there is no Steam Charts or SteamDB player count for it. Its live popularity is tracked here via Twitch viewership instead.

What platforms is Sonic the Hedgehog on?

Sonic the Hedgehog is available on Arcade, PlayStation 3, Wii, Sega Mega Drive/Genesis, PC (Microsoft Windows), iOS, Xbox 360, Xbox Series X|S, PlayStation 4, Android, PlayStation 5, Xbox One, Nintendo Switch, Sega Saturn, Legacy Mobile Device, Handheld Electronic LCD, Sega CD, Nintendo 3DS, Game Boy Advance.

When did Sonic the Hedgehog release?

Sonic the Hedgehog released on June 23, 1991.

Sonic the Hedgehog

Jun 23, 1991PlatformArcadePlayStation 3 Wii Sega Mega Drive/GenesisPC (Microsoft Windows)

Sonic the Hedgehog — frequently asked questions

Is Sonic the Hedgehog on Steam?: No. Sonic the Hedgehog is not distributed on Steam, so there is no Steam Charts or SteamDB player count for it. Its live popularity is tracked here via Twitch viewership instead.
What platforms is Sonic the Hedgehog on?: Sonic the Hedgehog is available on Arcade, PlayStation 3, Wii, Sega Mega Drive/Genesis, PC (Microsoft Windows), iOS, Xbox 360, Xbox Series X|S, PlayStation 4, Android, PlayStation 5, Xbox One, Nintendo Switch, Sega Saturn, Legacy Mobile Device, Handheld Electronic LCD, Sega CD, Nintendo 3DS, Game Boy Advance.
When did Sonic the Hedgehog release?: Sonic the Hedgehog released on June 23, 1991.

About Sonic the Hedgehog

Sonic the Hedgehog is a 2D side-scrolling platformer developed by Sonic Team and published by Sega for the Genesis/Mega Drive. Players control Sonic the Hedgehog, who can run at near supersonic speeds and sets out on a quest to defeat Dr. Robotnik, a scientist who has imprisoned animals in robots and seeks the powerful Chaos Emeralds.

Summary via IGDB.

Sonic the Hedgehog on Wikipedia

Sonic the Hedgehog is a Japanese video game series and media franchise created by the Japanese developers Yuji Naka, Naoto Ohshima, and Hirokazu Yasuhara for Sega. The franchise follows Sonic, an anthropomorphic blue hedgehog with supersonic speed, who battles the mad scientist Doctor Eggman and his robot army. The main Sonic the Hedgehog games are platformers mostly developed by Sonic Team; other games, developed by various studios, include spin-offs in the racing, fighting, party, and sports genres. The franchise also incorporates printed media, animations, films, and merchandise.

Source: Wikipedia (text under CC BY-SA 4.0).