There is no official "unblocked" version from SEGA. Almost all sites offering "Sonic Mania unblocked" are hosting pirated, browser-based copies or illegal emulations. Risks of Playing "Unblocked" Versions Before searching for these sites, understand the real dangers:
👉 Buy Sonic Mania Plus on Steam or mobile for as little as $5 during a sale. Play on your own device. If you can't afford it, try the official Sonic the Hedgehog classic browser game on SEGA’s website – it's free and legal. sonic mania unblocked
Sonic Mania is a critically acclaimed 2D platformer released in 2017 by SEGA. It combines reimagined classic levels (from Sonic 1, 2, 3, & Knuckles) with brand new zones. There is no official "unblocked" version from SEGA