The ledge sweet spot is the range around the fighter from the ledge of a platform at which a character is still able to grab the ledge in Super Smash Flash 2. This is normally in reference to a recovery such as an up special move, but can be referred to any special move that can act as an recovery or a when a character is falling normally and not using an aerial. The distance and ledge sweet spot varies from character and specials alike. An example would be Bomberman would be unable to grab the ledge from far away due to his recovery gaining mostly vertical distance and little horizontal distance. Mario is able to grab the ledge from far due to his various recover options. When talking about specials; when Meta Knight tries to use Dimensional Cape to grab the ledge. The move has to be properly angled in order to sweet the ledge or else Meta Knight will fall to his death, this is normally if it above or slightly next to the ledge in the right spot.
Certain recoveries are able to auto-sweet spot the ledge. Donkey Kong's Spinning Kong and Sheik's vanish are able to cancel the move and grab the ledge in the moves early frames. Certain recoveries need to be angled to auto-sweet spot the ledge. Marth's Dolphin Slash can auto-sweet spot the ledge when Marth is below it and is angled where he is at the right spot. They're certain specials that cannot auto-sweet spot the ledge even in the moves early frames. Wario's Corkscrew, Link's Spin Attack and Chibi-Robo's Chibi-Copter are unable to auto-sweet spot the ledge during their specials active frames, which can leave them vulnerable to edge guarders.
Characters with a Tether recovery have a much easier time grabbing the ledge due to the tether having large sweet spots. Almost every tether has a hitbox to knock opponents off the ledge in order to steal it.
Players try to sweet spot the ledge when recovering to avoid certain edgeguarding tactics and making guard breaking much easier. Sweet spotting avoids most ground attacks and certain aerials by recovering to low to be hit and if they're hit it makes ledge teching much easier. However, trying to sweet spot the ledge makes players vulnerable to edge hogging.