Luigi's Arena is the first Battle Course in Mario Kart: Ultra Prix. It is a simple square course with four ramps connected by bridges. There is a hill in the center surrounded by dirt which slows karts down. There are also grandstands and green hills in the background.
Placing bananas and fake item boxes on the narrow bridges will almost always damage enemy karts driving on them. Green shells are also effective due to the simplistic nature of the course.