Slow motion is a special condition that decreases the movement of characters and gameplay. When a character is in a state of slow motion, all actions and movements they perform will be proportionally slower. When the slow movement condition is finished, their speed will return back to normal. Each iteration of Special Smash has featured a slow motion mode. There is also an option in training mode that allows the player to reduce the speed of the gameplay to one of several presets.
In Super Smash Bros. and Super Smash Bros. Melee, slow motion effects are all global and decrease the frame rate of gameplay. From Super Smash Bros. Brawl onward, the frame rate remains unchanged, while animations and physics calculations instead interpolate sub-frames to account for the slower pace. Also introduced in Brawl are effects which slow just some fighters, as opposed to global slowdown which affects all fighters, stage elements, and other entities such as items. In Brawl, all slow motion effects still proportionally reduce the framerate for accepting inputs and hitbox updates, however as of Smash 4, slow motion induced by items or Witch Time instead apply a frame speed multiplier to the affected character, and as such inputs and hitbox updates still run with the full 60 frames per second, which can affect how hitboxes interpolate.
Causes of slow motion