The game has divided the items in different groups or categories.
Final Smash
There is only one item in this category: the Smash Ball. Destroying this item will grant the player who destroyed it the capability to execute their ultimate attack called the Final Smash. This is the only method in the game that allows you to do it so once you see it floating around, go ahead and prioritize destroying it!
Helping
Items in this category allows the user to call in random allies to help them out in battle temporarily. The summoning player can't control these allies while opponents can't hurt them as well. The attacks and effects produced by summoned allies are unique to themselves. Since they are random, some stages affect which type of allies will appear.
Items under this category:
Combining
There are only two items belong to this category; each of them are divided to three different parts that players must collect in order to fully assemble these powerful weapons and use it against their opponents. Attacking players carrying the parts will force them to drop it so it is possible to complete the weapon even if different players picked up the parts.
Items under this category:
Carrying
Carrying items are composed of containers that may contain other items inside when destroyed. There's a small percentage that these containers will explode upon destruction as well. These can be picked up and thrown towards enemies. Like Helping items, the selected stage affects what containers you'll get.
Exploding
Though there are other items that will probably fit in this category, only the Blast Box is listed as a separate type. This item can be carried and thrown, similar to Containers but will explode once enough damage is dealt immediately. One thing though; hitting a Blast Box with a fire attack can make it detonate instantly. The explosion can also damage you so be careful not to get caught in the blast.
Punching
The Sandbag is the only item that belongs to this type. This item drops recovery items when hit repeatedly. It will keep dropping items until it sustains enough damage where it will be launched off the stage quickly.
Recovery
These are healing items that lower your sustained damage percentage. This items need to be picked up in order for them to take effect. These recovery items have a varying amount of damage they can heal. Picking them up is a must, even if you have no damage yet since this denies your opponents from taking advantage of its benefits. The type of food that will appear will also depend on the stage.
Items under this category:
Transforming
As the name implies, items belonging to this type temporary alters the character's abilities, allowing them to perform moves that are otherwise unavailable to them. For example, a Super Mushroom increases the size of the player it touches while the opposite happens when someone touches a Poison Mushroom.
Items under this category:
Battering
Battering items are usually melee weapon capable of damaging or launching enemies upon hitting them. Most of the battering items degrade after every use while some, like the Hammer will remain active for a few seconds.
Items under this category:
Shooting
These are the projectile weapons in the game. They are usually charged and will be depleted after repeated use. Some of them, like the Drill are usable only once.
Items under this category:
Throwing
These are the items that players can lob at their opponents. Throwing items have a variety of effects; some deal direct damage, others cause negative effects, while some function as traps. You can also control the direction of the throw by tilting your Circle Pad to the desired direction.
Items under this category:
Gear
When picked up, these items provide fighters with equipment that help boost their capabilities.
Items under this category:
Effect
There is only one item under this item type: the Special Flag. When used, the player must hold it still until it is fully activated. In a Stock battle, this restores one life/ stock count. In a Timed battle, this adds one KO count to your KO total. You'll be vulnerable while holding this item so use this only after launching your enemy, or trapping them or restricting their movements.