Sonic CD is a game released for personal computers as well as for the Sega CD. It is also part of the Sonic Gems Collection for the Nintendo Gamecube.
Dr. Robotnik has taken over the Little Planet, captured Amy, and created Metal Sonic with the goal of collecting all the Time Stones to be able to manipulate time and conquer the world. It is up to Sonic to stop him, by rushing through levels set in different time periods, collecting Time Stones.
It is identical to the three main games of the Sonic The Hedgehog series on the Sega Genesis, in that the player must collect enough rings to enter into the bonus section in order to win one of the Time Stones. However, there is also the goal of destroying all the machines that will cause the future of all the zones Sonic travels through to become bad futures. To do this, Sonic must use the Past and Future gates and build up enough speed to travel through time to reach the different time periods and destroy the machines.
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