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In the Sonic the Hedgehog games, Sonic has to collect seven Chaos Emeralds. (Colored red, orange, yellow, green, blue, violet, and clear respectively.) There were only four Chaos Emeralds mentioned and all of them appeared to be colored the same.
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Sonic Sez: Don't play with sharp objects like swords.
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The way Sonic time-travels in these episodes is similar to how he does it in Sonic CD. The big difference however, is that in Sonic CD he needs to pass by posts that say "Past" or "Future", and needs to run really fast and maintain that speed for a certain amount of time before the warp starts. With the atomic-relativity boots, he is able to "circle the planet at the speed of light and enter a time warp", as explained to him by Professor Canine-Stein.
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The Robot Transmogrification Gun is somewhat similar to the Roboticizer from that other Sonic the Hedgehog series.