The Two-Three Tunnel is a tunnel between the cities of Twoson and Threed in EarthBound. Named for the cities it sits between, it is inhabited by ghosts that, after repeated warnings, take whoever is moving through the tunnel back to where they started, making walking or taking the bus through the tunnel impossible. Before Threed is rid of its zombies, the only way to travel through the tunnel is on the Runaway Five's bus, as the loud music drives the ghosts away.

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