Marble King, the soccer-like minigame found around the Breezy Meadow in Infinity Nikki, is one of the more fun minigames the game includes, but finding all 11 can be hard. As listed in the Folklore Guide, each of these minigames can be found in different parts of the region, and finding them all will grab you something extra, as Ciceto will want to thank you for your hard work researching Miraland’s various folk games. To get started, you’ll need to find Ciceto and chat with him in Florawish.

https://screenrant.com/infinity-nikki-all-marble-king-locations/