Smart Bomb (SSBW)

The Smart Bomb, sometimes called the "B-bomb" for the large B on its front, is an item in SSBW. It is one of the most powerful thrown items in the game. Once it hits an opponent, travels a certain distance, or gets attacked, it produces a large, slow explosion that envelops a big range and damages everyone inside in increments of 1% for about three seconds. Characters caught in the blast can shift their position using smash Directional influence, but usually cannot escape until the explosion ends and flings them away. The bomb does a great deal of damage but generally does not KO.

There is a small chance that a Smart Bomb will turn out to not explode; instead of going off it makes a distinctive echoing noise and travels 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 again. One can use Fox Illusion or any projectile to safely activate a Smart Bomb while the opponent is distracted.

Super Smash Bros. for Wii U/3DS
''Attack or throw this bomb if you want to make a big impact on the battle. The explosion just grows and grows, and despite the "smart" name, this bomb will hurt the thrower too! Sometimes you may throw what turns out to be a dud, but don't go hitting it in anger--it'll still go off in your face!''

Origin
The Smart Bomb comes from the Star Fox series, 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.

The Smart Bomb also appeared in Star Fox: Assault. The Smash series not only gets the item's name from Assault, but also it's design. It behaves in a similar manner to it's 64 counterpart.

Trivia

 * If there are lots of enemies in an area and multiple Smart Bombs go off at once, the game may lag.
 * If one detonates on one of Snake's mines, the mine explodes rapidly until the Smart Bomb ends.
 * In training mode, if five Smart Bombs (the most it's possible to have out at any one time) are placed near an opponent and detonated all at once, as well as dealing up to around 160% damage to the opponent, it is possible to get a sixty-hit combo, and, if you keep spawning them over and over, it is possible to reach a 999-hit combo.
 * In Kirby Air Ride, the bomb that characters can throw has similar effects as the Smart Bombs have in Super Smash Bros. Brawl.
 * The Smart Bomb has similar qualities to the black hole glitch in Super Smash Bros. Melee.