Wall
Walls are structures found on every stage in every Super Smash Bros. game in some capacity. They can cancel the momentum of a character that has been sent flying, and depending on launching speed and angle, can send that character in the opposite direction at a fraction of the knockback. In Super Smash Bros. Melee, characters were able to tech on walls to both cancel their knockback momentum and quickly revert to the neutral aerial positions to act with either an aerial attack or their recovery. Melee also introduced wall jumping, a technique available only to a few characters, which allowed them to jump off of any wall so long as it's angled at 90 degrees or less. Some characters, like Bowser, will automatically jump upon teching on a wall but otherwise cannot perform a true wall jump. A bonus is awarded for hitting, but not teching walls multiple times in a short time span during a match. Teching and wall jumping returned in Super Smash Bros. Brawl along with the wall cling technique, which was available to even fewer characters and allowed them to attach themselves to walls as an act of stalling. Automatic wall jumps were removed.
All walls will stop projectile attacks and dashing characters. For the latter, characters have a special animation signaling that they can't run in the direction of the wall. However, characters can walk infinitely into a wall, but won't go anywhere. The walls on Shadow Moses Island can be destroyed by attacks, and otherwise have the same properties as regular walls.
