Wall clinging is a technique introduced in Super Smash Bros. Brawl. As the name suggests, it allows the player to cling on walls. The wall cling is performed similar to a wall jump, except the control stick or d-pad is held towards the wall instead of being moved in the opposing direction. Only certain characters have the ability to wall cling. While clinging to a wall, characters can jump, allowing it to function like a wall jump. This can be achieved by pressing away from the wall or by pressing up or the jump button. If the control stick is pressed away from the wall, the character will wall jump off the wall. If it is pressed up, the character will instead double jump. Wall clings will not restore a character's double jump. All characters with the ability to wall cling can also wall jump, and may do so from the wall cling.
Additional wall clings and subsequent jumps can be performed without having to land. If used correctly in combination of wall jumps, one can get a huge vertical distance if there is a wall, allowing characters that can wall cling have a huge chance to survive sudden death if used properly.
The time that the character can cling to the wall for decreases each time the they perform a wall cling without touching the ground. For the first two wall clings, the character can stick for up to 3 seconds, and on consecutive clings the time is divided in half.
Steep walls, such as the ones found on Battlefield, can't be clung to.
Additionally, if Lucario's Extreme Speed is aimed into a wall, Lucario will cling to the wall.
Various Smash characters have used wall clinging in their source games. In Kirby Super Star, when Kirby had the Ninja copy ability, he had the ability to wall cling. In other games, such as Super Mario Galaxy and Metroid Prime 2: Echoes, Mario and Samus could stick to walls temporarily if they were in the process of wall jumping; however, this would only last for a second or two before they slid downwards. In Super Mario Odyssey, Yoshi could wall cling after sticking his tongue at a wall surface. However, none of these four characters can wall cling in Smash.
Diddy Kong could situationally wall cling in Donkey Kong Country 2: Diddy's Kong Quest, as he could stick to honey-covered walls in Hornet Hole and he has the same animation in Brawl for wall jumping from that game. Bayonetta's ability to wall cling is likely based on the Witch Walk ability from her home series, which allows Umbra Witches to walk on walls in moonlight.