Marble Sort Level 20 Walkthrough Solution | Marble Sort 20

Marble Sort Level 20 Guide: The Hidden Box Trap and 9-Block Squeeze

Marble Sort Level 20 is brutal because it baits you into a massive jam right from the start. The dominant colors on this board are Dark Blue, Green, Red, and Pink. Look up at the Top Tray. You have a Tunnel marked with a "3" locked down on the far left side. On the top right, a 2x3 block of Hidden Boxes sits completely out of reach.

But the real nightmare is the bottom row of the Top Tray. Massive 9-marble clusters of Dark Blue, Yellow, and Red sit dead in your way. Down below, your starting bottom Boxes demand Green, Red, and Light Green. If you try to force those big clusters early, you will instantly choke the belt.

The massive block pattern in Marble Sort Level 20

Your bottom Boxes set the rules for the entire match. Right now, the active front row is Green, Red, Green, Light Green. If a color is not one of those four, do not touch it.

The left side of the Top Tray is a mess. You have single Green and Dark Blue marbles sitting directly beneath the Tunnel, blocking a massive 9-marble Dark Blue block. The middle section holds Pink, Light Blue, and Red single marbles stacked directly above huge Yellow and Red 9-marble blocks. The right side has your Light Green, Green, Light Blue, and Red singles pinned underneath the question marks of the Hidden Boxes.

Here is the trap. The huge Dark Blue and Yellow blocks at the bottom of the tray look ready to drop. They are bait. Tap them, and nine unplayable marbles hit the Conveyor Belt. The belt clogs. Game over.

You must respect the order. The belt does not have room to hold a 9-marble block while you search for singles. You have to work front-to-back. Clear the single Green, Red, and Light Green marbles first. This unlocks the front row of Boxes, which then scrolls up to reveal a wall of Dark Blue and Red bottom Boxes. Only then can you safely dump those massive clusters.

Marble Sort Level 20 Step-by-Step Walkthrough

Follow this exact pull order. One wrong tap on a large block will end your run early.

Sniping the Front Line in Marble Sort Level 20

Your only goal right now is clearing the front row without touching the massive clusters at the bottom of the tray.

1. Check your active bottom Boxes. You need Green, Red, and Light Green marbles right now.
2. Pull the single Green marble from the middle-left column.
3. Grab the single Red marble from the middle columns.
4. Snipe the single Green and Light Green marbles from the right side, pulling them out from right below the Hidden Boxes.
5. Ignore the giant 9-marble blocks of Dark Blue, Yellow, and Red at the bottom of the tray. Keep your hands off them. Letting them hit the Conveyor Belt now is a guaranteed wipe.
6. Feed your selected singles into the bottom Boxes.
7. Clearing this first row is mandatory. It shifts the entire lower board up, revealing the next phase of the puzzle, and starts reducing the counter on the top-left Tunnel.

Managing the Dark Blue Flood in Marble Sort Level 20

The front bottom Boxes are gone. Now, the second row of Boxes activates. Suddenly, you have multiple Dark Blue and Red Boxes ready to accept marbles. The board is finally opening up.

8. Drop the massive Dark Blue marble cluster from the bottom left of the Top Tray. Because the Dark Blue bottom Boxes are active, these marbles will rapidly flow off the Conveyor Belt without jamming your space.
9. Send the massive Red cluster down right after it. Let the animations play out so the Conveyor Belt stays clean.
10. Watch the top-left Tunnel. After you clear the needed marbles, the counter hits "0". The Tunnel immediately spits out a massive block of Pink marbles. Leave it alone for a second.
11. Look at the top right. Dropping the right-side singles earlier has triggered the Hidden Boxes. The question marks flip over, revealing a fresh stack of Light Blue and Light Green marbles.
12. Check your Conveyor Belt pressure. You will likely have a few leftover Light Blue or Dark Blue marbles rolling around. Do not panic. Just wait for the bottom Boxes to rotate.

Clearing the Hidden Boxes in Marble Sort Level 20

The board is highly volatile now. The lower Boxes have shifted again, bringing Pink, Light Blue, and Yellow Boxes to the front line.

13. Release the massive Pink block that just dropped out of the Tunnel.
14. Your Pink bottom Boxes will eat the entire cluster, clearing up massive space on the board.
15. Tap the newly revealed Light Blue and Light Green marbles from the former Hidden Box section on the top right.
16. Feed them directly into the waiting Light Blue and Light Green bottom Boxes.
17. Clear the remaining massive Yellow block from the bottom middle of the Top Tray.
18. Send any remaining single marbles down the Conveyor Belt to finish out the final lower Boxes. Control your tap speed at the very end so you don't accidentally overload the belt while the final clear animations are still running.