Marble Sort Level 391 Walkthrough Solution | Marble Sort 391

Marble Sort Level 391 Guide: The Front Block Bait Trap

Marble Sort Level 391 is a massive trap disguised as an easy win. You open the board and immediately see four massive blocks of colors sitting right at the front. It is incredibly tempting to just tap them. Do not do it.

This specific board is designed to clog your Conveyor Belt in the first five seconds if you take the obvious bait. To survive, you have to completely ignore the front of the Top Tray and dig into the grey question mark tiles hiding in the back.

The Brutal Board Pattern in Marble Sort Level 391

Let’s break down exactly what you are looking at. The Top Tray is shaped roughly like a cross. The vast majority of the board is made up of grey Hidden Boxes marked with question marks.

Sitting flush against the front of the tray are four massive 9-marble blocks: Orange, Light Blue, Yellow, and Purple. Flanking the center of the board are two blue Gift Boxes with red ribbons and the number "3" stamped on them. Nestled right in the middle, perfectly exposed but surrounded by grey tiles, are single Pink, Green, and Purple marbles.

Now look at your lower Boxes. The active front row needs Dark Green, Purple, Pink, and Yellow.

Here is the exact trap in Marble Sort 391. If you tap the massive Yellow block at the front of the Top Tray, it will send a flood of Yellow marbles down. Your front-right Yellow box will take three. The rest will instantly fill up your Conveyor Belt. You only have limited slots down there. Because the other bottom Boxes need Dark Green, Purple, and Pink, you have nowhere to send the leftover Yellow marbles. The board jams. You lose.

The order of the lower Boxes dictates everything here.

• Column 1: Dark Green, Orange, Light Blue, Yellow.
• Column 2: Purple, Light Blue, Light Blue, Yellow.
• Column 3: Pink, Orange, Pink, Yellow.
• Column 4: Yellow, Orange, Green, Purple.

Notice the mid-game colors? Once the front row clears, you are going to face a wall of Orange and Light Blue. That is the exact moment those massive front blocks in the Top Tray become useful. Until then, they are deadly obstacles blocking your view.

Marble Sort Level 391 Step-by-Step Walkthrough

You have to play this board from the inside out. Your sole focus is revealing colors hidden under the grey tiles so you can clear the front row of lower Boxes without touching the massive front blocks.

Beating the Opening Trap in Marble Sort Level 391

The first moves are entirely about surgical strikes. You need to pull marbles from the middle of the board to force the grey tiles to reveal themselves.

1. Ignore the front row completely. Treat the massive Orange, Light Blue, Yellow, and Purple blocks as solid walls for now. Touching them is a guaranteed reset.
2. Tap the single accessible marbles. Look dead center in the Top Tray. You will see a single Pink, Green, and Purple marble resting just above the massive front blocks. Tap them to drop them onto the Conveyor Belt.
3. Reveal the Hidden Boxes. Dropping those center marbles will cause the adjacent grey question mark tiles to flip. This is how you generate the colors you actually need.
4. Feed the front row slowly. Use the newly revealed colors from the Hidden Boxes to fill the bottom Dark Green, Purple, and Pink Boxes. Keep your Conveyor Belt as empty as possible while you dig.

Triggering the Gift Boxes in Marble Sort Level 391

Once you clear a couple of the front lower Boxes, the board completely changes identity. The second layer of bottom Boxes reveals a heavy demand for Orange and Light Blue.

5. Activate the Gift Boxes. As you clear the Hidden Boxes near the middle of the board, you will trigger drops next to the two blue Gift Boxes. Once a nearby marble drops, these boxes will open and dump new playable marbles onto the board.
6. Watch the shift in the lower area. You should now have Orange and Light Blue bottom Boxes pushed to the front of columns 1, 2, and 3.
7. Unload the front blocks. Now that you have multiple bottom Boxes hungry for Orange and Light Blue, it is finally safe to tap those massive 9-marble blocks at the front of the Top Tray. Drop the Light Blue block. The marbles will instantly funnel into the waiting Light Blue boxes without clogging your belt. Do the exact same thing with the massive Orange block.

Cleaning up the Back Rows in Marble Sort Level 391

The late game pressure drops significantly once the massive front blocks are gone. You now have full access to the back of the Top Tray.

8. Target the final Yellows. The back of your bottom Boxes are heavily stacked with Yellow. Drop the massive Yellow block from the front of the Top Tray to wipe them out simultaneously.
9. Sweep the remaining stragglers. With the huge clusters gone, simply match the leftover Green and Purple marbles revealed from the Gift Boxes to the final bottom Boxes in column 4. Keep your belt clean and the level will clear itself.