https://www.gamespot.com/articles/super-mario-odyssey-guide-6-things-i-wish-i-knew-b/1100-6454374/

Super Mario Odyssey returns to the open area design of Super Mario 64 and Super Mario Sunshine, which means it's a game bursting with worlds to hop, skip, and jump through, as well as secrets to discover within them.

Over the course of the game, you'll collect hundreds of Power Moons as you attempt to chase down Bowser and rescue Peach. While many of these Power Moons are on the game's main path, the majority are hidden away, so you'll need to play smart and play well to get them.