subdirectory_arrow_right Sonic X (Game)
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Apart from a cameo in Sonic Adventure DX: Director's Cut (where he appears on Sonic X posters during Mission Mode), Sonic X for Leapster marks the only appearance of Sonic X character Chris Thorndyke in a Sonic the Hedgehog video game. Specifically, he appears in the animated cutscenes and cheers Sonic on off-screen each time a math problem is solved.
Sonic Adventure DX cameo:
https://www.youtube.com/watch?v=diWbgyPxhb4
Sonic X gameplay:
https://www.youtube.com/watch?v=ZywUhXukzRI
https://www.youtube.com/watch?v=diWbgyPxhb4
Sonic X gameplay:
https://www.youtube.com/watch?v=ZywUhXukzRI
subdirectory_arrow_right Sonic Adventure (Game)
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In the HD port of Sonic Adventure DX: Director's Cut, starting Mission 12 as Knuckles reveals several posters from other Sonic games and media:
•Sonic X, the animated series
•Sonic Unleashed
•Sonic the Hedgehog 4
•Sonic the Hedgehog (2006)
•Sonic X, the animated series
•Sonic Unleashed
•Sonic the Hedgehog 4
•Sonic the Hedgehog (2006)
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In the first cutscene of Sonic's story, Eggman is seen standing on top of building with a guard rail in front of him. This guard rail was removed, and the roof texture was changed in the DX version of the game.
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In the Dreamcast version of Sonic Adventure, you can explore under the deep water in the Egg Carrier Chao Garden. Under the water lies a secret ring far out of reach. This was removed in the DX update, because the depth of the water was reduced, probably to prevent Chao from swimming out of reach and getting stuck in the terrain.
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