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Sonic the Hedgehog 2: Pink Edition (2021-11-28 Update 2.2)

Credits: E-122-Psi
Additional programming and coding by:
MarkeyJester, MainMemory, Selbi, and many others

Controls

Amy Rose

Amy's abilities mirror those she utilized in the Sonic Advance series. She can't roll into a ball or use spin attacks; however, she has a number of abilities (mostly using her Piko Piko Hammer) to gain manoeuvrability and access areas Sonic had difficulty reaching:

Hammer Attack: Press A and Amy swings her hammer, damaging enemies. In addition, Amy can use her hammer to smash obstacles such as walls and hit springs.
Hammer Jump: Press Down + A on the ground and Amy smashes the hammer into the ground, launching her into the air.
Hammer Whirl: Press Down + A in the air and Amy swirls down toward the ground. If an enemy is hit Amy will bounce up again.
Upward Dash: Hold Up + B/C while on the ground and Amy will rev her feet on the spot as opposed to a spin dash. Let go of Down to charge full throttle in the facing direction. Be careful though, Amy is vulnerable to blockading obstacles and enemies.
Giant Steps: Hold Down + B/C while on the ground and Amy will take a giant step forward as opposed to a spin dash. This can be repeated so long as there is room. This move is good for getting up steep slopes; she can even get up slopes the others can't spin dash up!
Head Slide Attack: Press A during a Giant Step and Amy will slide forward, damaging enemies in her path.

Cream the Rabbit

Much like Amy, Cream's abilities mimic those in the Advance series. Cream is constantly aided by her pet Chao, Cheese, who can attack enemies on command. If you play as Amy or Big with Cream as your aid, they can also command Cheese:

Spin Dash: Hold Down + B/C while on the ground and Cream will rev up in ball form to perform a spin dash. Let go of Down to go full throttle in the facing direction.
Fly: Press B/C after jumping and Cream will begin fly. She will gain height by tapping A again repeatedly, using the D-pad to control what direction Cream is going. Cream cannot fly underwater.
Cheese Attack: Press A for Cheese to home in and attack a nearby enemy.

Big the Cat

An old ally of Team Rose has joined in the quest to stop Eggman. Big's bulk makes him slower and heavier than the others, but he can smash through obstacles easier and float on water, as well as use his fishing rod to target enemies far away. Big also has a hidden mission mode. Find Froggy hidden in each level (besides Death Egg Zone):

Lure Attack: Hold A to rev back and let go to release.
Body Slam: Hold Down and B/C while jumping to slam into the ground and enemies below. Body slam to break obstacles such as walls and rocks, and hit springs for higher propulsion.
Float: Big will automatically float in water. Hold Down to sink.
Upward Dash: Hold Down and B/C while on the ground and Big will rev his feet on the spot as opposed to a spin dash. Let go of Down to charge full throttle in the facing direction.

Extras

Difficulty Options available. Choose from Easy, Normal or Hard modes (Easy saves your ring count with checkpoints and has breezier layouts and bosses, Normal is the classic Sonic 2 run, Hard has tougher layouts and more resilient boss fights).
New shortcuts added to certain levels.
Secret paths can be found in Aquatic Ruin Zone, Mystic Cave Zone, Metropolis Zone.
Expanded 2 player VS mode:
Hill Top Zone is available as the fourth race course.
"Normal Items" and "No Items" modes added to options.