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Blue Spheres - Original Blue Spheres mode.Bonus Stage S - Glowing Spheres bonus stage.
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Bonus Stage R - Slot Machine bonus stage.Bonus Stage G - Gumball Machine bonus stage.Sky Sanctuary K - Knuckles' act (or, more accurately, just a boss fight).Death Egg B - Giant Eggman Robo boss fight, which was originally The Doomsday 2.Hidden Palace - Now has its own entry instead of being considered Lava Reef 4.Lava Reef B - Lava Reef Zone's boss area, which was originally Lava Reef 3.Extra/renamed entries compared to the original include:."Deathegg" was corrected to "Death Egg".Added alongside this was new shrunken-down icons for all the game's Zones (as previously the icons from Sonic 2 were reused), as well as new character portraits for the Sound Test: The level select now has a level preview icon, a feature that was previously only present in vanilla Sonic 3.The selection screen is more condensed, including more entries such as the "Gumball" bonus stage and all 5 multiplayer stages.The selected character(s) are displayed at the bottom right rather than indicated by a number below Angel Island.