A Crate, known as Box (箱,Hako?) in Japan, is an item that has appeared in the entire Super Smash Bros. series. Crates are containers which can hold various different items. When you pick up a Crate, because they are so heavy, you will not be able to jump or attack, and you will move very slowly while holding it. However, in Super Smash Bros., one could not move with it at all; this was a special ability available only to Donkey Kong. After the player has picked up a Crate, they can throw it up, forward, backward, or down. Crates are very similar to Barrels. If the player taps the control stick lightly, they cannot walk off ledges holding a Crate. But holding it down makes their character and the crate tumble off the ledge, and they drop the crate.
Exploding Crates are "dud" Crates that explode when destroyed and do not contain items. These Crates appear in all three games. One out of eight Crates are Exploding Crates. Exploding Crates deal around 49% damage and have strong knockback.
In Super Smash Bros. Brawl, Crates, along with Barrels, have a different appearance depending on what stage you are playing on. On a more futuristic stage, e.g. Lylat Cruise, they take on a futuristic appearance, and on more fantastical stages, e.g. Yoshi's Island, they look like wrapped-up presents.
Rolling Crates are a new type of Crate that appear in Brawl. These Crates are identified by their tiny, black wheels on the bottom, and can oftentimes go unnoticed. If a player hits this Crate, it will start sliding in the direction it was hit. Characters hit by the Rolling Crate will take damage and lots of knockback depending on the speed of the Crate, and the Crate normally breaks. Since characters can stand on top of them, players can take a ride on a Rolling Crate when it's been hit.
Crates were confirmed to return in Super Smash Bros. for Nintendo 3DS/Wii U on April 8, 2014. The only known difference is that the futuristic crates has gained a new redesign and that the present crate now has a lid and no horizontal ribbons on the sides..
A Crate will release lots of items when it's broken open. It's very heavy, so unless your character is strong, you’ll walk slowly while under its burden. You can throw Crates up, down, left or right, but it's hard to hit opponents because the throwing process takes time. Every now and then, a Crate will explode under duress.
Item holders. You can destroy these to get at the items they contain, but be careful, because they will sometimes explode when broken. In Super Smash Bros. Melee, crates were uniform in design, but this time around, their appearance will change to match the stages. They'll sometimes look futuristic--other times, they'll look like presents with fancy ribbons.
Throw or attack this crate to bust it open and get the goodies hidden inside. The crate may look different based on the stage you're battling on, but the items inside won't change. Sometimes these things can explode, however, so it's best to be very crateful around them...
Special crates that look like normal ones but have four wheels attached to the undersides. However, what is more obvious is the "cart" that the wheels are attached to, and the fact that Rolling Crates will always be placed squarely on the stage, and never at an angle. Try to destroy these and they will go rolling along, smashing everyone in their path. When a rolling crate is destroyed, it will reveal the same sorts of items found in normal crates. You can also jump on a rolling crate for a fun ride.
These normal-looking boxes actually have wheels on the bottom. Just give one a little nudge, and it's own weight will turn it into a rolling weapon. It's possible to ride on top of it, but you certainly won't be traveling in style. Be sure to jump off of the box before you roll off of the edge of the stage!