2D moons, also known as 8-bit moons, are Power Moons found within 2D sections. Having a pixelated 8-bit appearance, these moons can only be collected while Mario is within the 2D section, not allowing Mario to collect them in his normal state even from out of bounds. There is a speedrun that involves collecting all such moons in the game, known as All 2D Moons.

Moons

There are 28 2D moons in the game in total.

Kingdom # Name
Cascade Kingdom 4 Behind the Waterfall
Cascade Kingdom 17 Hidden Chasm Passage
Cascade Kingdom 35 Taking Notes: Hurry Upward
Sand Kingdom 9 Secret of the Mural
Sand Kingdom 10 Secret of the Inverted Mural
Sand Kingdom 80 Taking Notes: In the Wall Painting
Lake Kingdom 14 Taking Notes: In the Cliffside
Wooded Kingdom 6 Back Way Up the Mountain
Cloud Kingdom 9 The Sixth Face
Lost Kingdom 6 Avoiding Fuzzies Inside the Wall
Metro Kingdom 33 Taking Notes: In the Private Room
Metro Kingdom 36 Celebrating in the Streets!
Metro Kingdom 65 Down Inside the Big Screen
Snow Kingdom 30 Slip Behind the Ice
Seaside Kingdom 8 Ocean-Bottom Maze: Treasure
Seaside Kingdom 9 Ocean-Bottom Maze: Hidden Room
Seaside Kingdom 27 Seaside Kingdom Timer Challenge 1
Seaside Kingdom 65 Taking Notes: Ocean-Bottom Maze
Luncheon Kingdom 21 Beneath the Rolling Vegetables
Ruined Kingdom 4 Roulette Tower: Stopped
Bowser's Kingdom 31 Scene of Crossing the Poison Swamp
Bowser's Kingdom 32 Taking Notes: In the Folding Screen
Moon Kingdom 2 Along the Cliff Face
Moon Kingdom 34 Taking Notes: In Low Gravity
Moon Kingdom 35 Center of the Galaxy
Moon Kingdom 36 Edge of the Galaxy
Mushroom Kingdom 31 Secret 2D Treasure
Mushroom Kingdom 32 2D Boost from Bullet Bill