Urchin Underpass

Urchin Underpass is a battle course that appears as one of the new maps in Mario Kart 8 Deluxe. The map is based on the main Turf War map from Splatoon and contains elements from that game, such as several green and purple ink splotches scattered through out the course, acting as grass or dirt in most other courses, as well as Mario Kart elements like Boost Pads. There are various paths that all loop around to the main area and several bridges. The music is a variant of the "Splattack" theme played during Turf War matches. When there's one minute left in a match, the music will change to a variant of "Now or Never", which also played at the last minute in Turf War matches.

Like with Hyrule Circuit and Animal Crossing, the item roulette sound effect is a unique one to this course. In this case, it's the Stat Slot sound. In Coin Runners and Renegade Roundup, Splatoon's currency ﻿is used in place of Coins.

Trivia

 * This is the third course in the game to have a different music track when the timer has one minute remaining, after Big Blue and Mount Wario, which also have a different music track during their final segments.
 * This course and Animal Crossing are the only tracks from the Mario Kart games to have kanji in their Japanese names.