Portals

Portals are special objects in Geometry Dash. They modify the way the cube interacts with the level, and can even change the cube into a different form.

They change the square into a rocket, ball, UFO, change the square's size, gravity, and (as of 1.7.0) speed or even mirror the gameplay or (as of 1.8.0) create a copy of the player.

Manipulation Portals
The following portals change the way the player interacts with the level:
 * Gravity portal: There are two variants; yellow changes the gravity to up, and blue changes the gravity to down.
 * Mirror portal: There are two ringed variants; orange flips the screen to travel left, and blue flips the screen to travel right.
 * Size portal: There are two squarish variants; pink shrinks the player, and green enlarges the player. This reduces the jumping height of the cube and UFO, although the ship and ball still accelerate at the same speed. The player cannot be enlarged beyond normal size or shrunk more than once.
 * Speed portal: There are four arrow variants; etc.
 * Copy portal: There are two variants; orange produces a copy with reversed gravity and opposite colours which travels alongside the existing form, and blue deletes the copy. Each form can interact with the level independently. Dying with either form will terminate the remaining one.

Form Portals
The following portals change the form of the player:


 * Ship portal: The pink portal changes the player into a ship.
 * Ball portal: The red portal red changes the player into a ball.
 * UFO portal: The orange portal changes the player into a UFO.
 * Revert/cube portal: The green portal changes the player into a cube.