How do you get into room [20,11]?

Reach [20,10], then light and click the hidden gear below the save point.

How do you solve the constellation puzzle at [19,17]?

Connect the stars in the order listed in the table, starting from the second star on the right.

How do you reach the orb at [13,15]?

Roll, bounce off the wall, and land on the flower. Check every slope, including uphill ones.

What do the harp strings in the groundhog puzzle mean?

The strings are the solid chunks of earth. Read which chunk each mole is attached to.

How do you make a rolling wall break in MONOMOON?

Roll into the wall from a slope. If the slope is too short, make your character dizzy first.

MONOMOON Late-Game Puzzles: Solutions by Map Coordinates

Quick Answer

Find your map coordinate in the table below and read the matching fix. Coordinates are written column, row; see the MONOMOON coordinates guide.

Where	Problem	Fix
[20,11]	No way in	From [20,10], find the hidden gear below the save point. Light it with your cursor and click it.
[11,03]	Wall will not break	Use the slope in the top right, reached from (12,03). A dizzy character rolls faster out of a slide.
[12,10]	Blue gem behind a cracked wall	Go down the pipe on the left, time the gear platform, and roll into the cracked wall.
[01,16]	Blue gem	Ride the block to the top of the slope, send it back to the switch, then roll down while sending the block upward.
[08,09]	Orb behind a gate and platform	Hold one platform off-screen, then swap it for another off-screen platform. Do not change the water flow midway.
[13,15]	Orb on the flower	Start a roll, bounce off the wall, and reach the flower. Check every slope in the area.
Clam	Red orb	Bring the fish hook, not the bubble.
Giant clam	Underwater harp pieces do nothing	Put the four pieces together using their cracks and rotation, then read the notes from the stylised arrows at the top of Tome page 19. Look at the crescent, not the dot. The song is fixed, not random.
Castle paintings	No idea what to do with them	Hold the crimson moon to the Tome: page 4 shows a hidden fire in the castle behind a wall that only breaks by rolling. The throne room's antigravity blocks the roll unless the moon is already there. Use the fire to reveal the harp notes on the paintings, set them in the order on page 9, then play the song at the coordinates on the easel.
Frog and two moles room	The platform will not lower	Send a mole to the upper hole so it blocks the frog's sightline for a second, lower the platform a little, then quickly send the mole back up. Repeat until the platform is down.
Red vines left of the castle	Vines need fire	Unlock the area to the left of the castle first. Set your save in the room with the red vines, then carry the red flame there without touching another save point, using bubbles and rolls. Dying sends you back to that save with the flame, which is how you bring it in.
Bottom right of the map	Stuck near [23,2]	The breakable wall at [26,2] breaks by rolling into it from the left, and the yellow block switch is in the lower middle. Toggling a block you are standing inside is a needed trick.
[19,17]	Constellation	Connect the stars in order: second right, middle, second left, third left, top, third right, rightmost, bottom right, leftmost, bottom left, rightmost.
Groundhog fountain	Harp strings	The strings are the solid chunks of earth. Read which chunk each mole is attached to, and try flipping the notes.
Third pillar	Floating block will not reach the altar	Slot the moon into the top of the map while the block moves, so it stops at screen changes.
Rabbit tower	Acorn in the top-right vase	Do not jump. Keep rolling until you hit the wall.
Rabbit tower	Armadillo on the ledge	Bait it down with the pointer, then roll into it for a boost.
Fog room	Random exits	Follow the platform shaped like a symbol; every variant has one.
[10,01] tent	Second painting	Swing the cursor back and forth four times slowly with the moon off.
Page 7	Porcupine blocks the page	Lead the porcupine off-screen. The lab room with the box-crab teaches this.
Page 24 chest	Chest never appears	Press both buttons at once; the chest appears outside the room. The left button needs a box from several screens away, below the water tank.
Levitating-rock chest	No way to open it	Light the moon, leave the screen, then open the book to that chest's page.
Wall chest	Holes in the wall	Use your diamond-shaped map pins; the book shows all five numbers.
[12,02] area	Walls will not break	Roll into them. Read page 16 of the book under the crimson moon.
Top-right vines	Vines need fire	Set your respawn at [24,17], take fire from the brazier by the earth dragon, and die to the armadillo at [22,17]. Smuggle the moon back, then slide down the slanted tunnel at [25,17] while dizzy to skip across the water and burn the vines.

Which fix should you try first?

If a wall will not break, check the roll first, because walls break only by rolling into them. If a room has no way in, look for hidden gears under save points and for walls hidden by foreground art. For the third credit roll and what unlocks late areas, read the MONOMOON endings guide. Relic hunts are covered in the MONOMOON relics guide.