-> '''Dr. Eggman:''' "No robots were harmed in the creation of ''VideoGame/SonicColors''. They were all unfortunately harmed after the game was released."
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* CastingGag: The announcer in the Japanese version of ''Colors'' is Creator/FumihikoTachiki, who is the narrator for ''Series/KamenRiderW'' as well as the voice actor for the [[TransformationTrinkets Gaia Memories]], where he announces each power just like he announces the Wisp Powers in ''Colors''.
* ContentLeak: ''Sonic Colors: Ultimate'' ended up getting leaked on both the website for German localization team iksample and French retailer [=SoGamely=] a month prior to its reveal.
* DummiedOut:
** There's a bunch of unused voice lines in the files for the Wii version. Most are one-sided BossBanter from Sonic, meant to be heard during gameplay; there's also a few lines from Eggman for the final boss. Tails, meanwhile, has a lot of unused lines related to a cut HintSystem. The unused lines were eventually restored for ''Ultimate''.
** Text leftover in ''Ultimate'' expands on what the "Ghost Racer" mode would have been like, and also implies that there was going to be a Metal Sonic skin for Sonic, possibly after completing all Rival Rush levels.
* FirstAppearance: Of Cubot and the Wisps.
* FollowTheLeader: It’s clear ''Sonic Colors: Ultimate'' is one of Sega's ways of cashing in on the HD remaster/remake trend that got especially popular during MediaNotes/TheEighthGenerationOfConsoleVideoGames.
* LimitedSpecialCollectorsUltimateEdition: ''Sonic Colors: Ultimate'' got a pretty cool one known as the "30th Anniversary Package". This set included a copy of the game, a "Life in Sonic's World" art book and audio CD, and a collector's coin. However, this version was only released in Japan and Korea.
* MilestoneCelebration: ''Sonic Colors: Ultimate'' is one of several games made for the franchise’s 30th anniversary.
* NoPortForYou: Was originally the case for the Wii version until the announcement of ''Sonic Colors: Ultimate''. This is still the case for the DS version, unfortunately.
* TheOriginalDarrin: After being replaced by Creator/ColleenOShaughnessey from ''WesternAnimation/SonicBoom'' onwards, Creator/KateHiggins came back to record new lines for ''Ultimate'' and ''Rise of the Wisps''.
* TheOtherDarrin: Beginning with ''Colors'' and ''VideoGame/SonicFreeRiders'', the English dubs of the games have been recorded in Los Angeles and all of the [=VAs=] were replaced, save for Creator/MikePollock as Dr. Eggman.
* PreOrderBonus:
** Pre-ordering this game from [=GameStop=] would allow one to receive a hat shaped like Sonic's quills.
** Pre-orders in the UK came with action figures of Sonic and some wisps, with different wisps being exclusive to the version pre-ordered. Not everyone got the figures, though, since they ran out of supply.
** The ''Ultimate'' remaster came with a few different bonuses depending on what version you bought. The physical Launch Edition came with a keychain of Baby Sonic from ''Film/SonicTheHedgehog2020''. Those who pre-ordered the digital version received exclusive player icons, a boost aura based on the aforementioned feature film, and those who opted for the Digital Deluxe Edition were allowed to install and play the game four days before its official launch date.
* RefittedForSequel: Aquarium Park is based on an ''old'' concept for a Japan-themed underwater zone that originates from preproduction sketches of the original ''VideoGame/SonicTheHedgehog1'' game.
* RoleReprise:
** Creator/MikePollock, one of the cast members from the New York City-based dub of the games starting with ''VideoGame/ShadowTheHedgehog'' as well as the ''Anime/SonicX'' anime, returned to reprise his role as Dr. Eggman, despite everyone else being replaced.
** For the ''Sonic Colors: Ultimate'' remaster and the ''Rise of the Wisps'' cartoon, Creator/KateHiggins returned to record new voice lines for Tails, after having since been replaced in the role by Creator/ColleenOShaughnessey from ''VideoGame/SonicBoom'' onwards.
* WhatCouldHaveBeen:
** Creator/RyanDrummond auditioned for the game when Creator/JasonGriffith was fired. The reason as to why they casted Creator/RogerCraigSmith for Sonic instead is because Sega said that Drummond would have to leave his union and he would be paid very little.
** Creator/MikePollock revealed that Sega did consider replacing him too, but that none of the other actors that auditioned could match his performance as Dr. Eggman, so he ended up being the only member of the Creator/FourKidsEntertainment-era cast to stay.
** Based on concept art of the Egg Pawns, there would've been white enemy Egg Pawns designed specifically for Terminal Velocity, but appear to be scrapped. They do, however, appear on that level's world map.
** [[https://info.sonicretro.org/File:Joypolis2016_ConceptArt_WispsColors.png The Wisps went through several different designs before getting their current designs]], all of which look wildly different from their final designs.
** [[https://tcrf.net/Sonic_Colors_(Wii)#Unused_Audio Leftover voice clips]] in the game's files imply that there was originally a lot more banter from Sonic towards the bosses and between him and Eggman in the final boss. However, most of this was cut out, with Sonic remaining mostly silent in them. These voice clips would later be restored in ''Ultimate''.
** Unused voice clips also suggest that the Tails HintSystem from ''Ultimate'' was originally intended to be in the Wii version.
** If [[https://youtu.be/UrAaVLt59Fg internal files are any indication]], the Wii version was originally meant to follow the traditional ''Sonic'' structure of having two main acts and a boss, with the other acts being optional side missions. However, likely to pad out the game's length, this approach was scrapped and the two acts were split into multiple acts and the optional side missions became main acts instead, resulting in the six acts per zone seen in the final game. The DS version still follows this structure.
** In ''Ultimate'', the icon for the Final Color Blaster shows eight wisps (including the new Jade Wisp), even though the FCB still only uses the original seven in the final version, suggesting there was going to be an updated version of the attack at some point.
** ''Ultimate'''s Xbox store listing mentions a "Ghost Racer" mode that isn't present in the final game.
* WordOfGod: [[https://www.youtube.com/watch?v=TI0Jf3VssnU&t=337s According to Ian Flynn]], unlike the later [[VideoGame/SonicGenerations handheld]] [[VideoGame/SonicLostWorld versions]], both the Wii/''Ultimate'' and DS versions of ''Colors'' are canon. [[note]]While not outright explained, it seems to imply the exclusive interactions in the Wii version (like the faulty translator and Cubot's voice chip) and the missions given by Sonic's friends and the battle with [[spoiler: Nega Mother Wisp]] take place, the latter two seemingly confirmed by ''VideoGame/SonicRunners'' and ''VideoGame/TeamSonicRacing'' depicting Silver and Blaze as friends and the Mother Wisp existing.[[/note]]
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