The Crown Stars are 5 special stars that are found inside the 5th dimension. They are earned by doing 5 things in the 4th dimension. The things were:
- Breaking free from Dimentio's control
- Obtaining 120 D-Stars
- Defeating Dimentio
- Obtaining all 121st D-Stars
- Collecting all 9 replica D-Stars
When Mario found all 5, he claimed the title "Warrior of the Fourth Dimension".