Smart Bomb

The Smart Bomb (, Smart Bomb) is an item that appears in Super Smash Bros. Brawl, Super Smash Bros. 4, and Super Smash Bros. Ultimate. It is one of the most damaging thrown items in the game, with a large area-of-effect; however, it lacks in KO power.

Origin
The Smart Bomb originates from the Star Fox series. It was originally named the Nova Bomb. In Star Fox 64, it could either be locked on to opponents or triggered to explode after launch by pressing the button a second time. It also would explode on impact, or after it traveled a certain distance. It did not hurt Fox or his wingmen. In Smash, only the "B" on the bomb is shown.

Overview
Once the Smart Bomb hits an opponent, travels a certain distance, or gets attacked, it produces a slow, growing explosion that envelops a large area and damages everyone inside in increments of 1% for about three seconds, with a total damage of about 30%. The bomb does a great deal of damage but generally has the knockback to KO only around 150%. There is a small chance that a thrown Smart Bomb will fail to explode, instead making a distinctive echoing noise and traveling through its target, causing flinching but no knockback. A dud Smart Bomb will still explode when attacked and may explode at a random time, even when picked up and thrown again. In SSB4, it will not explode when held, although it may detonate almost immediately after throwing it.

In Brawl, characters caught in the blast can shift their position (and possibly even escape) using Smash DI. In SSB4, this is essentially impossible due to a reduction of the Smart Bomb's SDI multiplier; they can only possibly escape by hitting the exact edge of the explosion. In Ultimate, as with other explosive items, the player who throws a Smart Bomb no longer takes damage or knockback from the explosion.

Trivia

 * If one detonates a Smart Bomb on one of 's mines (down smash) the mine will explode rapidly until the Smart Bomb ends.
 * The Ultimate Chimera ignores anybody caught in the Smart Bomb's explosion.
 * While the Smart Bomb can equally harm the player who detonates it in the Smash games, it cannot harm its user or its teammates in any of the Star Fox games. This is seemingly changed in Ultimate where it doesn't harm the player who detonates the bomb, staying more faithful to the series.
 * If too many items get caught in the Smart Bomb's explosion, it can result in a game crash.
 * In Brawl, if a character manages to touch the Smart Bomb's explosion at the very end of it (after the "finishing hit"), they will not take any knockback and will instead go into their tumbling animation.