Climb

Climb (壁登り) is a common ability used in the Sonic the Hedgehog series, primarily by Knuckles the Echidna. Debuting in Sonic & Knuckles, Knuckles has since used it in several other games, and has also been used by Tikal, Chaos, and Rouge. It allows the user to climb and scale vertical walls.

Description
Typically, to perform a Climb, the user must first Glide or jump towards a scalable wall. Once the user touches it, he/she will place their fists into the wall, making a stable bond and will begin to scale it.

Sonic & Knuckles
The technique was introduced in Sonic & Knuckles. The technique allowed Knuckles to reach areas which were inaccessible to Sonic. It could be easily used in conjunction with the Glide technique, and at the time, Knuckles was the only user of Climb. When the player has glide to the wall, he/she can move by pressing up or down with D-pad and pressing jump button, the player normally jumps off the wall. Once the player has climbed to the top, the player is able to move normally. During the game, there are some walls, where Knuckles is unable to climb on for unknown reason.

Knuckles is able to glimb faster on walls, when he has got all Chaos Emeralds and transformed to Super Knuckles. Knuckles is able to climb on locked-on versions of Sonic the Hedgehog 2 and Sonic the Hedgehog 3.

Knuckles' Chaotix
Climbing returned in Knuckles' Chaotix as an ability usable by both Knuckles and Vector. Although Knuckles' version of the climb functions the exact same way as it does in Sonic & Knuckles, The player must hold the jump button down whilst climbing when playing as Vector.

Sonic Adventure
In Sonic Adventure, Knuckles could once again perform Climb, making it the first appearance in a 3D, free-roaming environment. At this stage, Knuckles was still the only character able to use Climb.

Sonic Adventure 2
Later, in Sonic Adventure 2, the technique was learned by Rouge the Bat, who could use it in treasure hunting stages in the same method as Knuckles. Tikal and Chaos could also use the same Climb technique in the multiplayer modes. While climbing, the user could use Dig to find objects inside walls.

Sonic Advance series
In the Sonic Advance series, Knuckles was once again the only character able to use Climb. It was used in much the same manner as in Sonic & Knuckles.

Sonic the Hedgehog (2006)
In Sonic the Hedgehog(2006), Knuckles and Rouge could again perform Climb. Climb was used in Sonic the Hedgehog (2006) in a very similar way as in the Sonic Adventure series, though much smoother, and also that neither Rouge nor Knuckles could Dig will climbing.

Sonic Chronicles: The Dark Brotherhood
In Sonic Chronicles: The Dark Brotherhood, Knuckles and Rouge could both perform Climb outside of battle. The Climb ability was marked by a ladder symbol, and was needed to reach high and otherwise inaccessible areas.