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In the 2011 remaster, entering the code PCM32 DA8 into the sound test brings up a level select that allows the player to start any level as Tails.
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In the 2011 re-release, there was originally going to be an extra boss that would have only been accessible after the player had collected all of the Time Stones, but it was ultimately scrapped.
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The 2011 rerelease version includes both the International and Japanese version's music. The user can toggle between the two music versions. However, due to licensing issues, some vocals from the Japanese soundtrack have been removed.
subdirectory_arrow_right Sonic CD (Game)
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The original Sonic CD intro is shorter and slower than in the updated versions. That includes collections and the HD version. The original includes scene of Eggman's face on the mountains in the original, but was cut on the updated versions.
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The achievement name "Paradise Found" is a parody of the 17th Century poem "Paradise Lost" by John Milton. When Sonic achieves a Good Future in any of the zones (via destroying the Metal Sonic projectors and roboticizers), he is essentially "founding" a paradise for the future of that zone.
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In the 2011 Xbox Live Arcade and PlayStation Network versions, the achievement for time travelling for the first time is called "88 Miles Per Hour", a reference to Back to the Future.
subdirectory_arrow_right Sonic CD (Game)
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When Sonic CD was being remade using Christian Whitehead's self-made engine, he wanted to include a new level called "Desert Dazzle". However, SEGA thought it was a bad idea to deviate from the original project. You can actually find a concept image with Christian's initials on it in the sound test by entering PCM:32|DA:8
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