LEGO Ideas—the community program where fans can get their dream sets made—currently has a Sonic submission up for voting, and it looks great.
Based on 2017's Sonic Mania, it would include Sonic & Eggman minifigs, a giant Eggman mech, a bunch of enemies, a Phantom Ruby, rings and some Green Hill Zone terrain modules that could be moved around.
It’s far from the first Sonic submission to the site, but I like how this one tones it down a little, focusing as much on the landscape as it does the minifigs. That, plus the fact it’s based on a recent and successful game, means it might actually get a shot at being made (provided Sega were willing to play ball).
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There are more pics of the playset pitch here.