SEGA has released Sonic The Hedgehog 4: Episode II, a 2D adventure game that allows players to play as Sonic, Tails, and Metal Sonic. The game features five distinctive zones, seven bosses, and a soundtrack composed by Jun Senoue. The game also includes Episode Metal, a bonus set of stages that allows players to play as Metal Sonic across fiendishly difficult versions of zones from Sonic The Hedgehog 4: Episode I. The game is available to download for free from the Google Play Store for Android devices. Players can remove ads for a one-time in-app purchase priced at $1.99/ €2.29 / £1.99. The game also includes added features such as leaderboards, cloud saves, and controller support.

Sonic The Hedgehog 4: Episode II was first released in May 2012 and was developed by Sonic Team and Dimps. The game's lead programmer was Koji Okugawa. The game's story takes place after the events of Sonic The Hedgehog 3 & Knuckles, and the halfpipe Special Stages return from Sonic The Hedgehog 2. The game may include "Interest Based Ads" and may collect "Precise Location Data," according to SEGA's privacy policy.

SEGA Forever, the collection that Sonic The Hedgehog 4: Episode II is part of, includes other classic SEGA games and features such as leaderboards, cloud saves, and controller support.