As Mario travels throughout the numerous Kingdoms apart of his journey, he will also be tasked with collecting Power Moons. These Moons will allow Mario and Cappy to power the Odyssey Airship during their adventure; however, they will also unlock a number of different Costumes as you collect more and more. During his journey, Mario will need to collect 124 Power Moons among the fourteen Kingdoms during the Main Story to ultimately save Peach from Bowser.
After the Main Story concludes, more Power Moons will be added to each Kingdom. in total, Mario can find and collect a total of 556 Power Moons among all the different Kingdoms. Mario can also purchase Power Moons for stores, obtain Power Moons from Toadette for completing certain achievements, and find Moon Rocks to unlock even more Power Moons. A player can find and obtain a grand total of 999 Power Moons.