Special Stage (Sonic the Hedgehog CD)

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The special stages in Sonic CD are slightly different to the usual Sonic special stages. They use a pseudo Mode-7 effect, and parallax backgrounds. Rather than collect a certain amount of rings or items, you have to destroy all of the UFOs flying around in the sky. When there is 20 seconds remaining, a blue UFO will appear. If destroyed, 30 seconds is added to the timer. If you touch the water, 10 seconds are deducted from the timer.Once you've destroyed all of the UFOs in the time limit you are given, you will receive a Time Stone(instead of a Chaos Emerald). If all of the Time Stones are acquired by the end of the game, you will experience the good ending of Sonic CD.