Is Sonic the Hedgehog 2 on Steam?

No. Sonic the Hedgehog 2 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 2 on?

Sonic the Hedgehog 2 is available on PlayStation 3, Nintendo 3DS, Wii, Sega Mega Drive/Genesis, PC (Microsoft Windows), Wii U, Xbox 360, Handheld Electronic LCD, Nintendo Switch, Legacy Mobile Device, Game.com, Xbox Series X|S, PlayStation 4, Windows Phone, Android, iOS, PlayStation 5, Xbox One.

When did Sonic the Hedgehog 2 release?

Sonic the Hedgehog 2 released on November 1, 1992.

Sonic the Hedgehog 2

Nov 1, 1992PlatformPlayStation 3 Nintendo 3DS Wii Sega Mega Drive/GenesisPC (Microsoft Windows)

Sonic the Hedgehog 2 — frequently asked questions

Is Sonic the Hedgehog 2 on Steam?: No. Sonic the Hedgehog 2 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 2 on?: Sonic the Hedgehog 2 is available on PlayStation 3, Nintendo 3DS, Wii, Sega Mega Drive/Genesis, PC (Microsoft Windows), Wii U, Xbox 360, Handheld Electronic LCD, Nintendo Switch, Legacy Mobile Device, Game.com, Xbox Series X|S, PlayStation 4, Windows Phone, Android, iOS, PlayStation 5, Xbox One.
When did Sonic the Hedgehog 2 release?: Sonic the Hedgehog 2 released on November 1, 1992.

About Sonic the Hedgehog 2

Dr. Eggman (aka Dr. Robotnik) has returned, turning helpless animals into robots and forcing them to build his ultimate weapon, the Death Egg! But this time, Sonic has a friend that can help him: Tails! Find the 7 Chaos Emeralds and stop Dr. Robotnik’s evil scheme!

Summary via IGDB.

Sonic the Hedgehog 2 on Wikipedia

Sonic the Hedgehog 2 is a 1992 platform game developed by Sega Technical Institute (STI) for the Sega Genesis. Players control Sonic as he attempts to stop Doctor Robotnik from stealing the Chaos Emeralds to power his space station, the Death Egg. Like the first Sonic the Hedgehog (1991), players traverse side-scrolling levels at high speeds while collecting rings, defeating enemies, and fighting bosses. Sonic 2 introduces Sonic's sidekick Miles "Tails" Prower and features faster gameplay, larger levels, a multiplayer mode, and special stages featuring pre-rendered 3D graphics.

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