The Spring (スプリング, Spring) (sometimes known as a Jump Pad) is an item in Super Smash Bros. Brawl and Super Smash Bros. 4. It was first confirmed for Brawl at E for All. Originating from Donkey Kong Jr., it propels a character skyward when jumped on. It can also land sideways, which causes anyone to bounce to the opposite side of the board. The springboard can be picked up and thrown, and when it comes in contact with other players, it will either deal damage or propel the character a certain direction.
Like the custom stage spring, if a character jumps on the spring while doing an attack, the attack will be canceled and the character will bounce up. It can be 'abused' by attacks like Marth's Counter. When thrown straight down, it causes the character who threw it to bounce off of it, restoring all of their jumps midair, as seen in this video.
Although its design in Brawl is taken directly from the Donkey Kong series, topped with simple purple platforms, the Spring in Smash 4 has a more detailed design on top, directing characters to stand on it.
The spring made its first appearance in the arcade game Donkey Kong Jr. In the second level of Donkey Kong Jr., there is a purple spring that is used to get up higher to get on a platform. The design of the spring in Brawl and SSB4 looks very similar to it's appearance in Donkey Kong Jr. The spring being able to be picked up and thrown likely comes from Super Mario World where players could pick up and move springs to access a certain area; however, throwing the springs does not damage enemies like it does in Brawl. Interestingly, the sound the springs make when they spring is the same as the jacks from Donkey Kong mentioned in the Spring's trophy.
Super Smash Bros. Brawl
An item used to assist jumping. Jump on it, and it will send you bounding sky-high. You can also toss enemies onto it. It originally appeared in the second stage of Donkey Kong Jr., where it was used as a shortcut to leap to a distant platform. It resembles the bouncing projectiles that appeared in Donkey Kong, but those are said to be actually jacks, not springs.
Super Smash Bros. 4