List of games you should play in order of priority:
- Sonic 3 & Knuckles; it's on Steam, via a serviceable Backbone port. Look up "Sonic 3 Complete" for the best possible experience. Easily a Top 10 of all time platformer.
- Sonic CD; Steam, XBLA 360, PS3N, iOS, Android. Really fucking good graphics and music, but with some seriously bizarre level design. You'll love it or hate it, still worth a play.
- Sonic Generations; easily the best 3D Sonic. The 3D sections are the perfect true speed run game and the 2D parts manage to at least invoke classic Sonic in a fun way despite not being wholly accurate. It's on 360 and PS3, but Steam version with gorgeous 60FPS and the amazing Project Unleashed mod is the way to go.
- Sonic and All-Stars Racing Transformed; forms one third of the Karting Trinity, with Mario Kart 8 and Crash Team Racing. Controls like a dream, fantastic level design and the fan service is on point. PS3, 360, Vita and Wii U, but the Steam version has 60FPS and Football Manager, Company of Heroes, Total War and Team Fortress characters, plus Ryo Hazuki as DLC.
- Sonic After The Sequel, aka the best fan-game ever. Must-play. It's free, of course, and PC only.
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