From the Super Mario Wiki
Retro Ramp-Up is the nineteenth course of Episode 3 in Captain Toad: Treasure Tracker. This course takes place in a tower resembling 25m from the Donkey Kong arcade game. Captain Toad must climb the tower while avoiding spike balls being thrown by a Spike. At the top of the tower, the player can find the Power Star.
A hidden 8-bit Luigi can be found behind the center of the first ladder.
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