Luigi Circuit

Luigi Circuit is a series of racecourses from the Mario Kart series, named after Mario's brother Luigi. This course, in some form or another, appears in the majority of Mario Kart installments and except the course from Mario Kart: Super Circuit, is usually among the simplest tracks. Even though they are usually among the easiest tracks, they differ in size, features, and obstacles.

History
Luigi Circuit has appeared a few different iterations throughout the Mario Kart series.