The Blast Box is an item in Super Smash Bros. Brawl. They look like crates but have a yellow sign with a flame, and on the sign says "Danger".
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A Blast Box.

If it is attacked for long enough, or has a short exposure to fire or explosions, it will explode, damaging those around it, often launching if they are at a high percentage. Blast Boxes, unlike Crates and Barrels, do not change their appearance from stage to stage.

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