For Blue Spheres, you have the option of playing through the game's original stages (which you'd have to clear to unlock this) or trying out the new Mania stages.
For Mean Bean, you have the option of playing against the computer or another player. These mini-games become playable at any time once unlocked in the Extras menu. How to unlock: 21 Medallions for Mean Bean, 32 Medallions for Blue Spheres.Like Sonic's alternate abilities and & Knuckles Mode, Debug Mode can be activated by entering the options menu via file select in Mania Mode. To enter item placement mode during gameplay, press allows you to cycle through items and if the chosen item is an Item Box, allows you to decide what type of Item Box. Debug Mode allows you to essentially break the game, placing helpful items wherever you please. This wouldn't be a classic Sonic game without its very own Debug Mode. Clear the zone for a secret alternate ending. Surprisingly enough, if you have this activated while playing Knuckles and have collected all seven Chaos Emeralds, Egg Reverie can be accessed as Knuckles. This can be activated in the options menu via file select in Mania Mode after it's been unlocked. You can now have Knuckles follow you around, even when playing as Knuckles. To activate either ability after having unlocked it, enter the options menu via file select in Mania Mode. This can come in handy particularly for bosses. Performing a double jump will cause a shield to flash around Sonic, giving him temporary invincibility against enemies that ordinarily would not be affected by a Spin Jump.
While the Super Peel-Out offers flashy speed, the Insta-Shield from Sonic 3 offers safety in the form of a temporary shield that forms around Sonic in mid-air. It can be performed by holding and / / and / / and / /. However, unlike a Spin Dash, the Super Peel-Out leaves him vulnerable to enemy collisions. The Super Peel-Out from Sonic CD is similar to the Spin Dash in that once charged, it launches Sonic forward at high speed, indicated by the infinity shape that his feet form. The Drop Dash is a feature meant to give classic Sonic fans a fresh experience, but if classic Sonic fans prefer a more authentic old school experience, then two special abilities from fan favorite Sonic games have made a return in the form of unlockables.