History Fridge / SonicTheHedgehog2

* Speaking of the Death Egg Zone. Why is it only a short level in this game and a full zone like in ''VideoGame/Sonic3AndKnuckles''?[[note]]It was actually intended to be a full zone, but they ran out of time.[[/note]] Because here, you hitched a ride on Robotnik's spaceship, leading you directly into the hangar, whereas in the latter game, you had to ascend from its entrance at the very bottom.

* Due to being DummiedOut, Sonic 2's Hidden Palace Zone is literally hidden in the code (albeit without most of the graphics).

* Due to being DummiedOut, Sonic 2's Hidden Palace Zone is literally hidden in the code. (albeit without most of the graphics).

** It becomes [[FridgeHorror]] when you discover that YES, you can destroy some of them, and when you hit those, they release an animal. [[InferredHolocaust But not when they self-destroy]]
* In Hidden Palace Zone (A level that was removed from the final game) one of the giant emeralds is covering a tube that you can roll in, leaving you to wonder why it's even there. [[WordOfGod Apparently]], the emeralds were originally intended to be breakable objects, meaning you were actually supposed to access that.

** Alternatively, Robotnik has realized he must RunOrDie, as he is unprotected and less than a meter away from the fasting thing alive, that put up with almost a dozen of his contraptions and an EvilKnockoff. Robotnik's ready for the last stand, and he is running faster than he ever has before out of pure fear (or determination).
* Speaking of the Death Egg Zone. Why is it only a short level in this game and a full zone in ''VideoGame/Sonic3AndKnuckles''?[[note]]It was actually intended to be a full zone, but they ran out of time.[[/note]] Because here, you hitched a ride on Robotnik's spaceship, leading you directly into the hangar, whereas in the latter game, you had to ascend from its entrance at the very bottom.

* In this game, when you can see Tails moving awkwardly while piloting the Tornado. By contrast, Sonic is completely calm when he's the one piloting it. This makes sense, as the Tornado belonged to Sonic, so he had more experience with it. Even though Tails is a genius, he hadn't meet Sonic until shortly before this game began, so he was still new at it. By ''Sonic 3 & Knuckles'' he's more experienced and comfortable with it, so he no longer moves awkwardly when piloting it.
* The Super Sonic transformation was Sega's way of paying homage to Franchise/DragonBall and one-upping [[Franchise/SuperMarioBros Mario]] (who becomes Super Mario by getting a Super mushroom).

* The fact that [[spoiler:Hidden Palace in the [=iOS=]/Android port uses the Mystic Cave 2 player theme instead of the unused Track #10, seems odd at first given the latter is more associated with the zone, but it makes perfect sense given that you acess the zone by falling into the place where Mystic Cave's infamous spike-pit resided, making Hidden Palace technically a part of Mystic Cave]]

* The Oil Ocean Zone is an environmental nightmare. The waters are so full of oil that you can bounce off of it, and the skies are orange. Though many of the other zones on Mobius look pristine, pollution does not stop at human designated boundaries and a site like this zone is bound to bleed into other places on Mobius.

* While this does require some extensive traveling across both acts of the zone to get rings, it is interesting to note that it's possible to obtain all seven Chaos Emeralds in the first zone, conveniently titled ***Emerald*** Hill Zone.

* The Super Sonic transformation was Sega's way of paying homage to Dragon Ball and one-upping Mario (who becomes Super Mario by getting a Super mushroom).

* The fact that [[spoiler:Hidden Palace in the [=iOS=]/Android port uses the Mystic Cave 2 player theme instead of the unused Track #10, seems odd at first given the latter is more associated, but it makes perfect sense given the zone is technically a part of Mystic Cave, given the way you access it is falling into the place where the spike-pit resided]]

* A possible InUniverse explanation for why the Hidden Palace Zone isn't in the game: it was so well hidden that Sonic couldn't find it!

* In this game, when you can see Tails moving awkwardly while piloting the Tornado. By contrast, Sonic completely calm when he's the one piloting it. This makes sense, as the Tornado belonged to Sonic, so he had more experience with it. Even though Tails is a genius, he hadn't meet Sonic until shortly before this game began, so he was still new at it. By ''Sonic 3 & Knuckles'' he's more experienced and comfortable with it, so he no longer moves awkwardly when piloting it.