Marble Sort Level 139 Walkthrough Solution | Marble Sort 139

Marble Sort Level 139 Guide: The Hidden Box Arrow Trap

This board is a masterclass in bait. You load in, look at the bottom Boxes, and realize immediately that the colors you need are completely hidden. Marble Sort Level 139 fills the center of the Top Tray with a massive U-shaped wall of Hidden Boxes marked with question marks. Worse, the outer edges are locked down by two massive columns of Arrow Boxes.

You start with a front line of bottom Boxes demanding Dark Green and White marbles. You have exactly one White block ready to go. The Dark Green marbles are nowhere to be found. They are buried behind the question marks. If you start clicking the brightly colored side arrows just to make things happen, your Conveyor Belt will fill up with dead colors. You will jam the board before you even clear the first row.

The massive Hidden Box wall in Marble Sort Level 139

Take a hard look at the exact layout before you tap anything. The board is designed to punish impatience.

The far-left column of the Top Tray is entirely Arrow Boxes. Reading from the top down, you have a Light Green right-arrow, a Light Blue right-arrow, another Light Blue right-arrow, and a Yellow up-arrow sitting at the very bottom corner. The far-right column mirrors this threat. It holds a Purple left-arrow, a Light Green left-arrow, a White left-arrow, and a White up-arrow at the bottom corner.

The center is dominated by the ? blocks. The only playable row is the very bottom edge of this center mass. From left to right, sitting just inside those corner up-arrows, you have a plain White block, a Yellow left-arrow, a plain Light Green block, a Blue right-arrow, and another plain Light Green block.

Now look at your bottom Boxes. The immediate targets are Dark Green on the far left, two White Boxes in the middle, and another Dark Green on the far right.

Behind the left Dark Green Box sits a Light Green one, then Pink, then Light Green. Behind the center-left White Box is Dark Green, Purple, and Light Green. Behind the center-right White Box is Pink, Blue, and Blue. Behind the right Dark Green Box is White, Yellow, and White.

This queue order dictates your entire early game. Light Blue, Purple, Orange, and Blue are totally useless right now. They are pure bait. The left side column of Light Blue arrows looks tempting to clear, but the Light Blue bottom Boxes do not appear until much later in the middle of the board. If you drop those Light Blue arrows early, they will sit on your Conveyor Belt and choke your space. Your sole objective is digging into the Hidden Boxes to find the Dark Green marbles required to break the front line.

Marble Sort Level 139 Step-by-Step Walkthrough

You have to carve into the center mass carefully. Do not touch the outer vertical columns yet. Your Conveyor Belt has just enough room to hold the junk colors while you hunt for the openers.

Cracking the hidden center in Marble Sort Level 139

The start of this level requires surgical precision. You must drop specific blocks to force the Hidden Boxes to flip and reveal their colors.

1. Tap the visible White block on the bottom-left center of the Top Tray. This sends it to the Conveyor Belt and automatically drops it into the center-left White bottom Box.
2. This drop pulls down the ? block above it. Watch what color it reveals. You are aggressively hunting for Dark Green.
3. Tap the Light Green blocks sitting on the bottom row. Even though the Light Green bottom Boxes are stuck in the second row, you must clear these pieces to pull down more Hidden Boxes. Let them sit safely on the Conveyor Belt.
4. Leave the Yellow up-arrow and White up-arrow in the bottom corners completely alone. Do not touch them. The Yellow bottom Box is buried deep in the far-right queue.
5. Activate the Yellow left-arrow and the Blue right-arrow in the bottom center. You need to clear that bottom row to expose the next layer of ? blocks. Blue and Yellow will take up temporary residence on your belt.
6. Once the new Hidden Boxes flip, immediately prioritize any Dark Green marbles that appear. Drop them into the far-left and far-right bottom Boxes.
7. Finish off the two center White Boxes using whatever White marbles the center mass spits out. Clearing this four-box front line shifts the entire game.

Managing the crowded midgame in Marble Sort Level 139

Breaking the front line brings up a totally new set of problems. The middle rows of the bottom Boxes heavily feature Light Blue, Dark Blue, Light Green, and Pink. Your Conveyor Belt is likely starting to sweat. You probably have a mix of Purple, Blue, and maybe an Orange marble clogging up your slots.

1. Look at the left column of the Top Tray. Now is the time to activate those Light Blue right-arrows. The Light Blue bottom Boxes are finally active. Tap them to clear them instantly.
2. Clear the Light Green left-arrow from the right side column. You have Light Green Boxes active in the second row.
3. Hunt for Dark Blue marbles. As you clear the Light Blue and Light Green arrows, the sides of the center mass will start exposing Dark Blue blocks. Feed these directly into the active Dark Blue bottom Boxes.
4. Ignore the Orange and Pink marbles in the center for as long as possible. The center mass loves to reveal a Pink left-arrow over an Orange right-arrow. These are midgame bait. Only drop them if you absolutely need to uncover the blocks directly above them.
5. Keep track of the Purple left-arrow trapped in the top right corner. The Purple bottom Box is buried in the third row on the center-left side. Do not let that Purple arrow drop until you have cleared the Dark Green Box sitting in front of it.

Surviving the final queue drops in Marble Sort Level 139

The board opens up significantly once the center mass is hollowed out, but the corner traps can still kill your run.

1. Clear the Pink and Orange pieces that you held back. The back rows of the bottom Boxes finally demand them.
2. Now you can safely tap the Yellow up-arrow stuck in the bottom-left corner of the Top Tray. The Yellow bottom Box on the far right is finally accessible.
3. Tap the White up-arrow in the bottom-right corner. The final White bottom Boxes are exposed in the back row.
4. Flush the rest of your Conveyor Belt. Any remaining Blue, Purple, or Light Green marbles sitting on the belt will easily slot into the final remaining lower Boxes.
5. Tap the last few revealed marbles at the very top of the grid. With the belt empty and the front rows gone, they will automatically fly into their matching homes to finish the board.