Dunkey Mode...
	Extras...
	Infinite time in Studiopolis Z...
	Super Sonic...
	Various Steam Achievements...
	Zone Select Menu...

Start a game and go to Hydrocity Act 1. Go to one of the swings that you hang from and grab on. While Sonic is swinging, press Left, Left, Left, Right, Right, Right, Up, Up, Up (the old stage select from Sonic 3). You will hear a confirmation ring noise. Whenever you use a speed booster in this zone you will hear a sound clip of YouTube personality VideoGameDunkey play for the remainder of the level.

Extras that can be unlocked by beating a specific amount of Blue Sphere bonus stages.

Unlockable	How to unlock
Blue Spheres	32 medals
D.A. Garden	26 medals
Debug Mode	16 medals
Insta-Shield	06 medals
Knuckles Mode	11 medals
Mean Bean	21 medals
Super Peel Out	01 medal

If time runs out when you are immaterial, being sent from an antenna to other, timer will freeze in 9:59:99 and you will not die. As always, if you beat the boss, you will get a 100000 points (2 ups) bonus.

You will be able to unlock Super Sonic as a playable character when you have collected all seven Chaos Emerald in the special stages.

Complete the indicated task to unlock the achievement.

Achievement	How to unlock
Boat Enthusiast	We really like boats (Ride all the boats in Hydrocity Zone Act 1)
Collect 'Em All	Gotta gacha 'em all (Let Eggman spawn all eight enemies during Metallic Madness Zone Act 2's boss fight)
Crate Expectations	Wreak havoc at the propaganda factory (Destroy crates in Press Garden Zone Act 1)
Full Medal Jacket	Collect silver medallions in Blue Spheres Bonus stage (Complete all 32 Blue Sphere stages)
King of Speed	Get through Stardust Speedway Zone as quickly as possible (Complete Stardust Speedway Zone Act 2 in under a minute)
Magnificent Seven	Collect all seven Chaos Emeralds.
No Way? No Way!	Collect gold medallions in Blue Spheres Bonus stage (Earn Perfects in all 32 Blue Sphere stages)
Now It Can't Hurt You Anymore	What would happen if you cross a bridge with a fire shield? (Cross a spike bridge while having a Fire Shield)
Professional Hedgehog	That elusive perfect run, only a professional can achieve (Complete Titanic Monarch Zone Act 1 without being damaged)
Secret Sub	You might have to submerge to find it (Find a hidden submarine in Oil Ocean Zone Act 2)
See You Next Game	Achieve any ending
Superstar	Spin the Star Post!
That's a Two-fer	Find the hidden item boxes at the end of the Zone (Use the signpost to uncover two item boxes at the end of Green Hill Zone Act 1)
The Most Famous Hedgehog in the World	Have your photos taken in Studiopolis Zone (Let the Shutterbugs take your picture 10 times)
The Password is "Special Stage"	Try pushing a barrel to see how far it goes (Push the first barrel in Mirage Saloon Zone Act 2)
Triple Trouble	Try for a 3 chain combo! (Get a 3 chain combo during the boss of Chemical Plant Zone Act 2)
Window Shopping	Let the wind take you through (Fly through a window in Flying Battery Zone Act 2)
Without a Trace	Barrel through the lava, don't let anything stop you (Move through lava in Lava Reef Zone Act 1 using a walker device)

The secret Zone Select Menu requires you to first unlock Debug Mode by collecting any 16 Silver or Gold Medals from the Blue Sphere special stages. Turn on Debug Mode by highlighting the "No Save" option on the file select screen, and pressing the key assigned to "Alt" to access to Secrets Menu. With Debug Mode turned on, highlight "No Save", hold the key assigned to Delete, and press the key assigned to Jump. Continue holding Delete until the Zone Select Screen appears.