Going through after beating the game and collecting all the remaining moons and this one was by far the most frustratingly tricky so far. Took a good 20 attempts. : r/SuperMarioOdyssey
ArtStation - Hidden treasure island
Hidden Treasures & Secrets: Sunken Ship Part 2 - Super Mario RPG - Star Hill Region - Walkthrough | Super Mario RPG (2023) | Gamer Guides®
Mushroom Kingdom Power Moon 31 - Secret 2D Treasure - Super Mario Odyssey Guide - IGN