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Secret Smash is a co-op event match in Super Smash Bros. for Wii U. In it, player 1 controls Duck Hunt and player 2 controls Mr. Game & Watch and must defeat another Duck Hunt and Mr. Game & Watch in a stock battle on the Gamer stage. The players have 1 stock while the opponents have 2. If either player is defeated, the event results in a failure. On the stage during this event, 5-Volt is extremely powerful and can possibly OHKO.
Completing the event on hard difficulty awards the player with the Sprinter Collar equipment.