The Smart Bomb (スマートボム, 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.
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.
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.
A bomb that explodes and causes damage to all characters within its range when thrown or attacked. The explosion from this device is so large, the deployer may be caught in the blast if he or she is not careful. In Star Fox, this item will explode after a set time or can be set off immediately with a button press.
In Super Smash Bros. 4