Antista, Chris (July 9, 2011). "New Sonic Generations 'City Escape' trailer is incredibly important". GamesRadar. Future Publishing. Archived from the original on October 4, 2017 . Retrieved October 3, 2017. This is the only game dubbed in French, Spanish, German, and Italian to not have the Wisp announcer voiced in those languages, with the game using its English voice instead. While the console/PC version has a level from Sonic Heroes as part of the second era (Seaside Hill), the 3DS version has a stage from it part of the third era (Egg Emperor). In the 3DS version, Sonic Heroes' stage representation is spread throughout the eras as the game's Special Stages.

a b c Sterling, Jim (October 31, 2011). "Review: Sonic Generations". Destructoid. Enthusiast Gaming. Archived from the original on November 29, 2016 . Retrieved October 3, 2017. Newton, James (October 21, 2011). "Sonic Generations 3DS Release Dates Finally Revealed". Nintendo Life. Gamer Network. Archived from the original on September 27, 2017 . Retrieved September 29, 2017.The launch trailer for the 3DS version has a small mistake. During the Modern gameplay showcase, a clip from Classic Water Palace is shown. This is the first handheld Sonic game on a Nintendo console that features fully rendered 3D stages and dynamic camera angles. Whereas they appeared before the final boss and at Sonic's party in the end of the console/PC version's story, Shadow and Silver have no role in the 3DS version's story. Despite a new antagonist called the Time Eater, the plot still revolves around Chaos Emeralds and Dr Eggman.

Workman, Robert (May 4, 2012). "Sonic Generations Review (3DS)". GameZone. Archived from the original on April 2, 2016 . Retrieved October 3, 2017. In the 3DS version, Classic Tails suddenly appears after the boss battle with the Death Egg Robot/Big Arm. Takashi Iizuka said that there was going to be an explanation but it never got worked into the game's story, and he wanted to leave it open to the fan's opinion.While Modern Sonic's gameplay in the console/PC version is a mix of 3D and 2.5D platforming (similar to Sonic Unleashed and the Wii version of Sonic Colors), his gameplay is solely in 2.5D (similar to Sonic Rush, Sonic Rush Adventure and the Nintendo DS version of Sonic Colors). a b c Sonic Generations Official Strategy Guide. BradyGames. November 1, 2011. ISBN 978-0744013429. When announcing the Cyan Laser, the announcer uses its voice clip from the Nintendo DS version of Sonic Colors, rather than the Wii version. Metal Sonic, Shadow, and Silver's rival battles are simply races to the finish, rather than actual battles.

Jones, Elton (June 30, 2015). " 'Sonic Runners': Top 10 Tips & Cheats You Need to Know". Heavy. Archived from the original on September 2, 2017 . Retrieved May 5, 2017. Both City Escape and Radical Highway are the first stages for both Sonic and Shadow in Sonic Adventure 2 respectively. Both stages represented the second era. Turi, Tim. "Sonic Generations Review: Dimps' Reliable Quality Skips A Generation". Game Informer. GameStop. Archived from the original on April 1, 2016 . Retrieved October 2, 2017. Schreier, Jason (April 7, 2011). "Nostalgic Trailer Teases New Sonic the Hedgehog". Wired. Archived from the original on December 24, 2011 . Retrieved December 15, 2011. With the exception of the Egg Dragoon, all of the bosses in the console/PC version can only take half the amount of hits the 3DS version's bosses can (four in the console/PC version, eight in the 3DS version).

a b c d Berry, Jason (June 14, 2011). "E3 2011 Q&A: Takashi Iizuka on Sonic Generations". Sonic Stadium. Archived from the original on March 29, 2016 . Retrieved September 28, 2017. On the console/PC version, Classic Sonic and Modern Sonic fight each rival ( Metal Sonic, Shadow the Hedgehog, minus Silver the Hedgehog) in the areas Sonic fought them in the original games, but the 3DS version has Sonic fight them in areas he did not fight them in the original.