Warp Hole

The Warp Hole is a gimmick that first appeared in Sonic Adventure 2 and it's remake Sonic Adventure 2: Battle. It is a portal for space transportation that allows player to move to different locations.

Description
Like its name would imply, the warp holes can transport those that enter them to be teleported from one location to another. They are presented as swirling portals of energy that float in midair.

The warp holes can be encountered during normal gameplay in the games' levels. Touching a warp hole will instantly take the player to another section of the levels, which can either serve as a shortcut or the only possible means of getting to that location, but they cannot be used to go back to the location the player was at before.

Sonic Adventure 2
In Sonic Adventure 2, the player can use the Warp Hole only by finding Ancient Ruin and activates it (if the player has got the Mystic Melody upgrade). When using the Ancient Ruin then it will open the Warp Point that it's appearance is a small white ball that can be seen above the ground. In this game, the player can also use the Warp Hole again to teleport back as well because the Warp Hole will always be in the same area.

Shadow the Hedgehog
The warp holes second appearance was in Shadow the Hedgehog. In this game, the color of the warp is yellow. Here, the warp holes are used by Shadow in the game's different Stages where they are either needed to complete the Stages or serve as shortcuts. They can be found in Black Comet, Death Ruins, Digital Circuit, Space Gadget and The Last Way some of them which are hidden behind locked doors.

Sonic the Hedgehog (2006)
The warp holes reappeared in Sonic the Hedgehog (2006). In this game, the color of the warp is blue and they can be encountered in the Action Stages and Town Missions. In Action Stages, the warp holes can only be found in Shadow's White Acropolis and in Town Missions they can be encountered in missions such as Town Mission 18: The Test of Intelligence, Town Mission 20: The Test of Love.

Unlike warp holes Shadow the Hedgehog, the user will be teleported directly to the exit area without waiting for the game to load said area.