Mac users interested in 3d sonic the hedgehog generally download:
Sonic Robo Blast 2 is a 3D open-source Sonic the Hedgehog fangame built using a modified version of the Doom Legacy port of Doom. SRB2 is closely inspired by the original Sonic games from the Sega Genesis, and attempts to recreate the design in 3D. While SRB2 isn't fully completed, it already features tons of levels, enemies, and quite a lot of the fun that the original Sonic games provided.
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Sonic the Hedgehog 3D is a 3D platformer game for Mac.
Sonic the Hedgehog 3D is a 3D platformer game...by classic Sonic games. Unlockables
“It’s like Super Mario, Donkey Kong, Castlevania...
Megaman, & Sonic The Hedgehog packed