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The SEGA logo during the game's introduction is blue in the Japanese release, but white in the internetional release.
Contributed by ProtoSnake
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After pausing for a short period, sketch will develop a speech bubble that reads "Sega!"
Contributed by KnightOfGames
After clearing a panel of all enemies, pressing the down button rapidly will cause Sketch to fart.
Contributed by KidDivinegon