This is the official remaster released by SEGA, developed by Christian Whitehead and Stealth (the team behind Sonic Mania ). It features widescreen support, the "Hidden Palace Zone," and polished 60FPS gameplay. This version is available as an APK through various official and community-archived sources. 2. Status of the Official Sonic 2 Android Port
Between 2008 and 2017, a team of fans developed Sonic 2 HD – a ground-up remaster of the game with hand-drawn HD sprites. (only a demo for Windows was released). The team disbanded after Sega issued a non-commercial cease-and-desist or due to internal collapse. No official Android version ever existed.
Let’s clear up some persistent rumors:

