Target Blast bomb
From SmashWiki, the Super Smash Bros. wiki
The Target Blast Bomb is a special bomb that is exclusive to Target Blast in Super Smash Bros. 4. It has a fuse and a timer on it. When the player attacks or touches it, the fuse will burn and the countdown begins along with the corresponding song to this mode. Players will have ten seconds to send it flying before it explodes. When that happens, it will destroy targets, blocks, and bonus items around it. If the player does not launch the bomb, its explosion will hit them, dealing at least 100% damage (as it will fully charge Cloud's Limit Charge) and imparting incredibly high knockback, or causing a shield break. In Super Smash Bros. for Wii U, the bomb is bigger in the second round and causes a bigger explosion. Unlike the Sandbag, the bomb is programmed to have a very high fall speed so that when falling, it can accelerate downwards almost indefinitely, simulating real life physics.