The Warp Star (ワープスター, wāpu sutā) is an item appearing in Super Smash Bros. Melee and Brawl that sends a player flying off into the sky and crashing back down into the stage when picked up. It is possible to control the landing location by pressing left and right on the Control Stick. Because of this, it's possible to miss the stage and self-destruct. If a character is hit hard when the Warp Star is first grabbed, the item can be "dropped" before it can be used. The Warp Star can then be grabbed and used normally. A shield will not protect against the star's impact, except for Yoshi's shield, so the only way to avoid damage is to not get struck.
Since Warp Stars crash into the stage from above, they can be used to "leap" to a higher part of the stage. Therefore, stages with many platforms can limit its effectiveness (and, in the case of scrolling stages with high off-screen platforms such as Rainbow Cruise or Rumble Falls, can even cause an SD). The Warp Star's ability to travel left and right before landing seems to have been diminished from Melee to Brawl. In Melee, it could travel farther left or right, which often results with jaded Brawl players to SD. A factor that most people forget is that the player is invincible while "on" the warpstar. However, if one uses the Warp star and runs into Jigglypuff'sFinal Smash on the way up, they will still receive knockback from the attack.
A warp-speed item. In the Kirby series, Warp Stars are used to move between stages. In Smash Bros., they're ultrafast attack items that zoom up and down to devastate anyone they hit. You can shift your landing spot by moving the Control Stick left or right during your descent. Choose your target and hang on! Don't overshoot the mark and plummet off the stage, though.