If this item is thrown backwards, it explodes after three seconds. When thrown forwards, the Bob-omb waits until another driver veers near it and explodes by them. This item later became a regular item in Mario Kart DS and Mario Kart Wii. In Mario Kart 64, there are Mini Bomb Karts which resemble Bob-ombs. Additionally, both Mario Kart Wii and Double Dash!! have some courses that include Bomb-Cars, which are similar to Mini Bomb Karts and very similar to Bob-ombs.
Mario Kart: Double Dash!! also includes a "Bob-omb Blast" battle game. Characters acquire nothing but Bob-ombs from the Item Boxes, and can carry up to five Bob-ombs at a time. Once thrown, the Bob-ombs will explode as soon as they hit the ground and damage anyone in the blast radius except for the person who threw the Bob-omb (the Bob-ombs and their explosions are colour-coded to match the players).