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From Sonic Retro

Buttons are pretty bog-standard items placed liberally around levels which alter something in the level when pushed.

Sonic 1

• Marble Zone
  • Raises a spiky metal stomper.
  • Moves a large green pillar.

• Spring Yard Zone
  • Opens doors.
  • Raises a platform.

• Labyrinth Zone
  • Opens doors.
  • Makes a hidden platform appear. (act 1)
  • Changes the layout of the level. (act 3)

• Labyrinth Zone (SMS/GG Version)
  • Changes a ring monitor into an extra life.

• Scrap Brain Zone
  • Changes the direction of a revolving wheel that grabs Sonic.
  • Causes the floor to collapse. (act 2, when Dr. Eggman presses it)
  • Makes a large platform move down a slope. (act 3)

Sonic 2 Beta

• Oil Ocean Zone
  • Releases a rolling ball.

Sonic 2

• Metropolis Zone
  • Extends various rolling platforms.

Sonic 3 & Knuckles

• Angel Island Zone
  • Opens a passageway.
  • Destroys a bridge. (Act 2, when Knuckles presses it)

• Hydrocity Zone
  • Opens a floodgate
  • Turns on some propellers underwater
  • Destroys another bridge (Act 2, when Knuckles presses it)

• Carnival Night Zone
  • Raises water and turns out the lights. (Act 2, when Knuckles presses it)
  • Turns the lights back on. (Act 2)
  • Reverses the direction of a gravity tube. (Act 2, when Knuckles presses it)

• Ice Cap Zone
  • Causes floors to collapse, after ice covering is destroyed

• Mushroom Hill Zone
  • Closes a door. (Act 1, when Knuckles presses it)
  • Opens that same door. (Act 1)

• Flying Battery Zone
  • Makes drills move

• Lava Reef Zone
  • Opens stone doors

• Sky Sanctuary Zone
  • Extends a bridge (Act 1, when Knuckles presses it)

• Death Egg Zone
  • Reverses gravity (Act 2)

Sonic Triple Trouble

• Great Turquoise Zone
  • Causes a firestorm (Act 3, when Knuckles presses it)

• Meta Junglira Zone
  • Causes a firestorm (Act 3, when Knuckles presses it)

• Robotnik Winter Zone
  • Causes an avalanche (Act 3, when Knuckles presses it)

• Special Stage
  • Causes a column of fire to appear (Stage 1, when Nack presses it)

Sonic Adventure

• Station Square
  • Causes a line of rings to appear.