Battle Course 4 is a battle course in Mario Kart Wii. It first appeared in Super Mario Kart, making it a retro battle course. Much like Battle Course 3, the entire course is a square. 20 walls surround each corners. They increase in size the closer they are to corner. Five walls are on each corner (total is 20). One set of five walls are red, another set are blue, the third set is green and the fourth set is yellow. A yellow square of sand is in the center of the entire course. Item Boxes are squished between walls. The battle course appeared in four tournaments (March 2009, March 2011, June 2012 and September 2013). In the tournaments, players had to collect 50 Coins while avoiding Oil Slicks found on the track as well as other hazards.