Marble Sort Level 137 Walkthrough Solution | Marble Sort 137

Marble Sort Level 137 Guide: The Arrow Box and Tunnel Trap

Marble Sort Level 137 hits you with a massive visual trap right out of the gate. You load in and see a heavily structured U-shaped board packed with bright colors. The dominant hues are pink, yellow, orange, brown, and light blue. The layout looks symmetrical, but the sorting logic is completely twisted.

The biggest threat here is the aggressive Conveyor Belt crowding caused by inaccessible colors. You have four active bottom Boxes begging for marbles, but the Top Tray is deliberately layered to deny you the exact colors you need. If you start clicking without a plan, the limited belt space fills up instantly. The jam happens fast. You have to dissect this specific layout column by column to find the safe pulls.

The U-Shaped Board Pattern in Marble Sort Level 137

You need to understand exactly how this board is stacked before making a single tap. The board identity here is built around buried targets and heavy Mystery Box usage.

Look at the Top Tray. It features a deep central gap, forming a strict U-shape. At the very bottom of the four outer columns, you will see four Arrow Boxes pointing upward. On the far left sits a green Arrow Box. The inner-left column ends in a pink Arrow Box. The inner-right column holds an orange Arrow Box, and the far right column terminates with a blue Arrow Box. Because these point up, you cannot activate them until the marbles stacked above them are cleared out.

The columns themselves are stacked with bait. The far-left column holds a pink marble, a brown, a light blue, and is capped at the top by a numbered pink box. The inner-left column holds yellow, blue, orange, white, and another numbered pink cap. The inner-right column features yellow, light blue, and orange. The far-right column holds light blue, brown, light green, pink, and another numbered cap.

Now look at the dead center. Deep in the U-shape recess sit two blue Tunnels, each marked with a 4. This means they are hiding four marbles inside. Directly beneath those Tunnels are orange and brown marbles. Below those sit textured purple and blue blocks.

Your bottom Boxes dictate your opening moves, and this is where Marble Sort Level 137 gets mean. You have four stacks. Stack one on the far left opens with an active Pink Box, followed immediately by three Mystery Boxes. Stack two is completely visible: Brown, Orange, Yellow, Light Blue. Stack three demands Yellow, then Orange, a Mystery Box, and finally Brown. Stack four on the far right demands Purple, backed by three Mystery Boxes.

Here is the trap. Look at your active lower Boxes: Pink, Brown, Yellow, Purple. Now find the purple marbles in the Top Tray. They are buried at the absolute bottom of the center columns, pinned under orange and brown marbles, which are pinned under the Tunnels. You cannot fill that Purple Box early. It is completely dead weight on the board. You must work the left and middle stacks first.

Marble Sort Level 137 Step-by-Step Walkthrough

You have to play front-to-back. Ignore the right side of the bottom area entirely. Focus purely on freeing up the left and center-right Boxes to keep the Conveyor Belt moving.

Surviving the First Drops in Marble Sort Level 137

Your opening moves must be highly disciplined. You only have space for a few mistakes.

1. Target the Yellow Box in stack three and the Brown Box in stack two. Pull the easily accessible yellow marbles from the inner-left and inner-right columns.
2. Pull the brown marbles from the far-left and far-right columns. This immediately satisfies two of your lower Boxes and clears crucial top-layer garbage.
3. Once the top pink marble on the far left is exposed, drop it into the Conveyor Belt to start filling the active Pink Box in stack one.
4. Leave the central orange and brown marbles alone. Do not touch the center area under the Tunnels. If you dump those marbles into the belt right now, they will just sit there and choke your space.
5. Focus on clearing the vertical columns to activate the Arrow Boxes. Once the marbles above the pink and orange Arrow Boxes are cleared, they will trigger, dropping down and shifting the board state.

Exposing the Tunnels and Mystery Boxes in Marble Sort Level 137

Clearing those first few bottom Boxes triggers a massive mid-game shift. Your Mystery Boxes will finally flip and reveal their true colors. This is when the board opens up.

6. Check your newly revealed bottom Boxes. The Mystery Boxes will likely flip to Light Blue and White.
7. Now you can safely attack the center. Drop the orange and brown marbles from beneath the Tunnels to fill the matching newly revealed bottom Boxes.
8. This finally exposes the textured purple marbles at the bottom center of the Top Tray. Drop them immediately to clear that stubborn Purple Box on the far right that has been blocking you since the game started.
9. With the space under the Tunnels completely clear, the Tunnels will activate. They hold four marbles each. Watch the colors they spit out carefully. Only pull from them if you have an active bottom Box ready to receive that exact color.
10. Keep peeling away the far-left and far-right columns to drop those numbered pink boxes at the top corners.

Clearing the Final Stacks in Marble Sort Level 137

The late game is all about managing the sudden flood of hidden colors.

11. The final Mystery Boxes in stack one and stack four will flip. Route the final marbles pouring out of the Tunnels to these boxes.
12. If the Conveyor Belt gets tight, prioritize matching colors that instantly clear a Box rather than partially filling two different ones. A cleared Box cycles a new one in, potentially saving a jammed run.
13. Clear the remaining green and blue marbles hidden behind the bottom Arrow Boxes to finish the sorting chain. Stay patient, let the Tunnels empty at your pace, and the board will clear.