To defeat the tunnel, four swords can be connected. At the beginning of the battle, the tunnel will emit bundles of green spikes. Destroy these spikes first, and then shoot with four swords to win. Besides, you can also use potions or avoid getting hurt, which can help you win the battle.
Tao Xin is the enemy in the game, located in the hidden island of the seventh world of Mario and Luis superstars.