Marble Sort Level 31 Walkthrough & Solution

Level 31 Board Overview: Two Reds, One Home

Level 31 plays a dirty trick in the first five seconds. The front line of the Top Tray offers you five blocks — Red, Light Pink, a second Red, Green, and Dark Blue — and the bright colors practically beg to be tapped. But the receiver Boxes below only want Orange, Red, Orange, and Dark Blue. Count the Reds: two blocks, one Box. That is the trap in a nutshell.

The upper half of the tray is split by an empty vertical gap running down the middle, with a blue Tunnel marked 3 on the left side locking colors behind it. The far top corners hold Yellow and Light Blue blocks you will not need until the very end. And down in the lower section, four Mystery Boxes wait in the second and third rows, ready to demand colors at the worst possible moment.

The Trap in Marble Sort Level 31

• The double Red: tap both Red blocks and the second one just parks on the Conveyor Belt eating space. Only one Red Box exists at the start.
• The missing Orange: two of your four active Boxes want Orange, yet not a single Orange block is exposed. Both are buried in the second and third rows, hidden behind the very blocks you are deciding whether to tap.
• The Mystery Boxes: four of them, layered into the lower section. Each reveal can demand a color you cannot reach, so a cluttered belt is a death sentence.
• The Tunnel: colors you need mid-game are trapped behind the 3-count Tunnel on the left, and it only releases once you clear the blocks in front of it.

The whole opening is about uncovering those two Orange blocks without jamming the belt.

Marble Sort Level 31 Step-by-Step Walkthrough

Do not touch the left side of the board yet. The left Red and the Light Pink have no use right now.

Opening: beating the double Red bait

1. Tap the Red block sitting in the middle-right of the front line, just below the central gap. It fills the one open Red Box — and exposes an Orange block behind it.
2. Leave that Orange alone for a beat.
3. Tap the Dark Blue block on the far right of the front line. It clears the fourth-column Box and uncovers a second Orange block.
4. Now the board is perfect: two Orange blocks exposed, two Orange Boxes waiting. Tap both Orange blocks and clear them.

Mid-game: reacting to the reveals

5. The first column now wants Green and the third wants Pink. Tap the Green block and the Light Pink block from your front line to clear both.
6. The second and fourth columns flip to Mystery Boxes. Stop tapping and let the question marks reveal their colors.
7. If a revealed color is exposed in the Top Tray, release it immediately to keep the chain alive.
8. If the color you need is stuck behind the Tunnel, drop the blocks directly in front of it — the Tunnel only spits out its contents once the path clears.
9. Keep the belt as empty as you can through this whole phase. With four Mystery Boxes in rotation, the next demand is always a surprise.

Cleanup: the back rows finally open

10. The top corners release Light Blue, Yellow, and the last Pink blocks. Match the Light Blue blocks into the deep third-column Boxes first.
11. Save the top-left Yellow for the very end — its Box is buried deep in the lower section.
12. Sweep the remaining revealed Boxes. When in doubt, clear any available matching pair rather than waiting, as long as it strands nothing on the belt.

Level 31 Tips Recap

• Two Red blocks, one Red Box — tap only the middle-right one at the start.
• Every early move should uncover Orange; those buried blocks are the real key.
• An empty belt is your insurance against the four Mystery Box reveals.