Sonic CD
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Sonic CD is the 1993 Sonic adventure famous for its time travel and its soundtrack.
Run fast past signposts to travel between past, present and future versions of each zone, and change the future by what you do in the past. It mixes Sonic's speed with more exploring than most entries. Rings, loops and Metal Sonic are all here.
It runs free and unblocked in your browser, with no download.
Start running and find the time posts.