Pitfall

The Pitfall (, Pitfall Seed) is an item that appears in Super Smash Bros. Brawl, Super Smash Bros. 4 and Super Smash Bros. Ultimate. It hails from the series.

Origin
In all games in the Animal Crossing series, pitfall seeds are items that can be found buried in the ground with the exception of New Horizons, which requires a crafting recipe for a pitfall seed. If the player or an animal walks over a buried pitfall seed, they will fall and be temporarily stuck in a hole. Players can dig up pitfall seeds and rebury them elsewhere, making it possible to pull "pranks" by setting traps for animals or other players to fall into. Unlike in Smash, buried pitfall seeds are visible in the form of an X-shaped mark on the ground, although they are indistinguishable from other buried items such as fossils.

Overview
When thrown, the Pitfall can bounces off walls until it touches the ground, which it then embeds itself into with no trace, but will disappear with a puff of smoke after a few minutes. Unless the opponent is invincible, the next enemy to walk onto its location will sustain damage and become buried. Characters on a platform will remain buried for the normal duration as determined how much damage they sustained, though characters on a fall-through platform will be spiked downwards through the platform after the "buried" animation has finished. This also happens when the item is thrown at a grounded enemy. When thrown at an airborne enemy or at an enemy hanging on an edge, the target is meteor smashed. Having multiple Pitfall items and planting them in the exact same spot can cause more damage than usual.

In Ultimate, Pitfalls will not bury downed characters (including if Olimar lands on one after his Final Smash), but the audience may still cheer as usual.

In Super Smash Bros. Brawl
The Pitfall item appears as a trophy in Super Smash Bros Brawl. It is obtained by completing 100-Man Brawl with any character.

Trivia

 * In Brawl, if strikes a buried Pitfall while riding on his Wario Bike (and is not wheelieing or taunting), he will be sent flying for a near certain KO. This is due to how Wario is considered grounded despite being unable to be buried or plunged, and so he takes the full effect of the planted Pitfall's fixed knockback value of a ludicrous 300 (designed for a long bury time). This knockback value is also why the crowd cheers when someone enters a Pitfall.
 * Likely in order to prevent this scenario in Ultimate, the Bury Immunity support Spirit skill will completely negate damage and knockback from pitfall seeds, while with all other sources of burying, the burying attacks will simply deal the knockback they are programmed with rather than burying the opponent.
 * The incoming damage reduction provided by the Brick-Wall Style is considerably greater against the Pitfall, possibly as a nod to Booker and Copper originating from the same series.