Mario and Toad enter Inferno Island Entrance to find that a corrupted Wario and Waluigi are just landing at Inferno Island, meaning there is still hope. Along the way, the duo is stopped by Boom Boom, who challenges Mario to a tennis match for access to the rest of the island.
In this mission, Mario must play a three-set match with Boom Boom. The obstacles during the match is the Mechakoopas that explode near Mario. Boom Boom himself will easily rally the ball through normal means, but has trouble rallying Star Shots.
Afterwards, Boom Boom leaves, and Mario and Toad fix their eyes on the Power Stone ahead.
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