This puzzle pairs a hidden center block with tricky corner arrows. The key to beating Marble Sort Level 139 is to focus solely on the bottom row of the Top Tray, ignoring the tempting side columns until the first set of Boxes is filled.
The Top Tray has a central mass of Hidden Boxes (question marks) with a U-shaped wall. The left column contains, from top to bottom: a Light Green right-arrow, a Light Blue right-arrow, another Light Blue right-arrow, and a Yellow up-arrow at the corner. The right column holds a Purple left-arrow, a Light Green left-arrow, a White left-arrow, and a White up-arrow at the corner. The bottom row of the central mass, from left to right, has a plain White block, a Yellow left-arrow, a plain Light Green block, a Blue right-arrow, and another plain Light Green block.
Marble Sort Level 139 Walkthrough
The bottom Boxes on the far left and far right require Dark Green, while the two center Boxes need White. Behind the left Dark Green Box, the queue is Light Green, Pink, Light Green. Behind the center-left White Box, the order is Dark Green, Purple, Light Green. Behind the center-right White Box, you'll find Pink, Blue, Blue. Finally, behind the right Dark Green Box, the sequence is White, Yellow, White.
The main trap is the temptation to clear the outer columns early. The Light Blue arrows on the left look easy, but the Light Blue Boxes don't appear until later; dropping those arrows early will clog your Conveyor Belt. Similarly, the Yellow and White up-arrows in the bottom corners must be left alone until their respective Boxes are exposed.
How to Beat Marble Sort Level 139 — Step-by-Step
Phase one: Opening the Front Line
- Tap the plain White block on the bottom-left center of the Top Tray. This sends it to the Conveyor Belt and then into the center-left White bottom Box.
- Watch the Hidden Box above it flip, revealing a color—you're hoping for Dark Green.
- Tap the two plain Light Green blocks on the bottom row, even though the Light Green bottom Boxes are still in the second row. These moves pull down more Hidden Boxes; the Light Green marbles can rest on the belt.
- Activate the Yellow left-arrow and the Blue right-arrow in the bottom center. These colors will wait on the belt temporarily.
- As new Hidden Boxes reveal, prioritize any Dark Green marbles and drop them into the far-left and far-right bottom Boxes.
- Use any White marbles that appear to fill the two center White Boxes, completing the front line.
Phase two: Clearing the Midgame Columns
- Now that the front line is gone, focus on the left column's Light Blue right-arrows. The Light Blue bottom Boxes are now active, so tap each arrow to clear them instantly.
- Next, tap the Light Green left-arrow on the right side column, as Light Green Boxes are now available in the second row.
- As you clear those arrows, the sides of the central mass will expose Dark Blue blocks. Feed these into the active Dark Blue bottom Boxes.
- Be cautious with Orange and Pink marbles that appear in the center. Only drop them if they block access to needed pieces; they are not required yet.
- Hold off on the Purple left-arrow in the top right corner until the Dark Green Box in front of it is cleared, as the Purple bottom Box is still buried.
Phase three: Final Queue and Cleanup
- Once the central mass is hollowed out, start clearing the Pink and Orange pieces you held back—the back rows of the bottom Boxes now require them.
- Tap the Yellow up-arrow in the bottom-left corner of the Top Tray; the Yellow bottom Box on the far right is now accessible.
- Tap the White up-arrow in the bottom-right corner to fill the final White Boxes in the back row.
- Empty your Conveyor Belt of any remaining Blue, Purple, or Light Green marbles by matching them with the remaining lower Boxes.
- Finally, tap the last few revealed marbles at the very top of the grid. With an empty belt and cleared front rows, they will automatically slide into their matching homes.
Tips & tricks
- Always check the order of marbles behind each bottom Box before making a move; this tells you what to expect.
- Keep your Conveyor Belt as empty as possible, especially early on, to avoid jams.
- If you have a choice between clearing a color that has an active Box and one that doesn't, always clear the active one first.
Common mistakes
- Tapping the outer vertical columns prematurely leads to a clogged belt, as those colors are not yet needed.
- Ignoring the Hidden Boxes in the center and focusing on side arrows delays your progress, making the board harder.
- Dropping the corner up-arrows too early can force you to wait for their matching Boxes to appear, wasting moves.
Marble Sort Level 139 FAQ
Why does my Conveyor Belt flood on Marble Sort Level 139?
Because you're likely activating the outer arrow columns too early, filling the belt with colors that have no active Boxes yet.
Which color do I clear first on Marble Sort Level 139?
You should clear Dark Green and White first, as they are needed for the front bottom Boxes and are hidden behind the question blocks.
How many moves does it take to clear Marble Sort Level 139?
There is no fixed move count; the level is cleared when all marbles are sorted, so focus on efficiency rather than a specific number.
Do I need boosters to beat Marble Sort Level 139?
No, boosters are not required, but they can help if you make a mistake and need to clear a jammed belt.
What happens if I tap the corner up-arrows early on Marble Sort Level 139?
Those arrows drop Yellow and White marbles that have no available Boxes yet, causing them to sit on your belt and reduce your space.
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