Portals

Portals are special map components in Geometry Dash. They modify the way the player interacts with the level and can also change the icon into different forms.

Trivia

 * Falling above the 60 unit grid due to the effects of antigravity will result in a crash.
 * While under the effects of the size portal, the cube acquires a unique design that is not found in the Icon Kit. This also applies to the cube carried by the ship and UFO. The ball acquires a virtually identical design to its default but smaller.
 * The slow speed portal was formally introduced in Update 1.8 in Hexagon Force, but was actually introduced in Update 1.7, selectable for use in the level editor.
 * While under the effects of the dual portal, a collision with either icon will terminate the other and result in a crash.
 * While under the effects of the dual portal, the vertical grid is locked to 9 vertical units, unless at least one of the forms is a ship, a UFO, or a wave, where the grid is then locked to 10 vertical units.
 * If entering a form portal of the same form the icon is currently and the portal is of a higher or lower position to the previous portal, the grid will vertically shift to realign with the new portal, with the exception of the cube and robot portals which do not lock the grid. This is demonstrated only once in an official level on Stereo Madness with the alternate route for the third secret coin.
 * The wave is unable to interact with jump variants of pads and rings.
 * The robot was the first animated form.
 * Entering manipulation portals offers additional visual cues:
 * The gravity portal shows brief lines moving in the direction of the gravity. This does not occur with the ball.
 * The mirror portal clearly reverses the screen direction.
 * The size portal has the icon struck by a bolt of lightning and the screen flashing twice.
 * The speed portal shows coloured particles of the respective portal colour moving against the direction of the icon for a short time.
 * The teleportation portal has a bolt of lightning connecting the two portals and the screen flashing briefly.
 * The activation gravity portal is the only manipulation portal that does not share its colour with a form portal.
 * The size portal is the only manipulation portal that does not use the colour blue.
 * The colours of the teleportation portals are a reference to the game Portal, with blue entry portals and orange exit portals being features of the game.
 * The ball and robot portals are the only form portals which do not share their colours with a manipulation portal.
 * Combinations of portal effects that have not been used in official levels include dual UFO, mirror wave, mirror robot, mini robot, very fast speed robot, slow speed robot and dual robot.