Co-Op Event 11: The Great Remodeling Battle
From SmashWiki, the Super Smash Bros. wiki
The Great Remodeling Battle (リフォーム大作戦, Great Remodeling Battle) is the 11th co-op event match out of a total of 21 in Super Smash Bros. Brawl. This is a standard Coin Battle in which Luigi and Peach must collect 300 coins without destroying any of the breakable pillars in Luigi's Mansion. If the players or their opponents destroyed any of the breakable pillars, the match will end in failure, meaning that the players will have to be careful when battling the CPU opponents.