The CD-Factory is a stage, where it's name is basically what it is. What you do, is you have 2 players, you and a friend, or another controller, and you make a stage with, 1 normal block, and a few rotatory belts. Then, after completion, go to Brawl and set Items to only have Sandbag, and put the item appearance on High. Pick your character (one with repetitive moves)(I chose Bowser for slow attack and more damage), and enter the stage you made. Repeatedly hit the sandbag against the block.
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