Marble Sort Level 15 Walkthrough Solution

Marble Sort Level 15 Guide: The Center Counter Trap

You load up the level. Dark Blue, Orange, and Light Blue dominate the starting view. The Top Tray is packed into a massive block, five columns wide, narrowing near the top. Down below, your starting bottom Boxes demand Dark Blue, Light Blue, Dark Blue, and Orange. Dead center in the upper rows sits a gray countdown obstacle with a "3" stamped on it. You need three bottom clears before that center path opens up.

If you just start tapping the bottom row, you will lose. Marble Sort Level 15 is designed to bait you into filling your Conveyor Belt with colors you cannot use.

The Blocked Center Pattern in Marble Sort Level 15

Look closely at the front row of your Top Tray. From left to right, you have Red, Orange, Orange, Light Blue, and Purple.

Now look at your four active bottom Boxes. They are Dark Blue, Light Blue, Dark Blue, and Orange.

Notice the massive trap here. There is absolutely zero Dark Blue in the playable front row. You have two Dark Blue Boxes begging for marbles, but those colors are buried deep in the stack. You have to dig for them. But you cannot just blind-dig, because your Conveyor Belt only has seven slots.

Here is exactly how the board is stacked against you:

Column 1 (Far Left): Capped by Red. Behind it sits Purple, then Light Blue, then Dark Blue. This entire column is pure bait. Do not touch it at the start.
Column 2: Capped by Orange. Crucially, it hides Dark Blue right behind it.
Column 3 (Center): Capped by Orange. It hides Light Blue behind it.
Column 4: Capped by Light Blue. It hides Red behind it.
Column 5 (Far Right): Capped by Purple. Behind it sits Yellow, then Dark Blue. Another pure bait column.

Your bottom Boxes dictate the flow. Lane 1 wants Dark Blue. Lane 2 wants Light Blue. Lane 3 wants Dark Blue. Lane 4 wants Orange.

Because the outer columns (Red and Purple) have no matching active Boxes, tapping them will instantly crowd your Conveyor Belt. You must work the center three columns. Clearing the Orange and Light Blue blocks in the middle is the only safe way to expose the Dark Blue marbles hidden in row two.

Everything in Marble Sort 15 revolves around ticking down that center "3" counter. You have to execute three fast clears to unlock the back half of the board.

Marble Sort Level 15 Step-by-Step Walkthrough

Follow this exact release order to survive the opening trap and keep your Conveyor Belt clean.

First Taps and Clearing the Orange Bait in Marble Sort Level 15

Your only goal right now is hitting three clears to unlock the center counter. Ignore the outer columns entirely.

Tap the Orange marbles in Column 2.
Tap the Orange marbles in Column 3. This sends them down the Conveyor Belt and instantly clears the active Orange Box in lane 4. That is your first clear.
Tap the front Light Blue marbles in Column 4.
Tap the newly exposed Light Blue marbles in Column 3. This sends them into the active Light Blue Box in lane 2. That is your second clear.
Look at Column 2. The Dark Blue marbles are now exposed. Tap them. They will drop right into the waiting Dark Blue Box in lane 1. That is your third clear.

Boom. Three clears. The gray "3" counter in the middle drops to zero. The board identity completely changes.

Surviving the Midgame Shift in Marble Sort Level 15

Once that center counter clears, the inner core of the Top Tray is yours. The next layer of bottom Boxes pushes up. The exact Box order changes, revealing Purple and Red demands.

Now those outer columns are finally useful.

Look at Column 5 on the far right. Tap the Purple marbles. Send them straight into the newly revealed Purple Box.
Look at Column 1 on the far left. Tap the Red marbles. Get them off the board and into the active Red Box.
This exposes the deeper Light Blue block in Column 1. Drop it to feed the next Light Blue Box that rotates in.

The Conveyor Belt is incredibly vulnerable during this midgame transition. You will see Green and Yellow marbles exposed in the middle rows. Leave them alone. If you drop the Yellow block from Column 2 or the Green blocks from Column 3 before their target Boxes appear, you will brick the level. Only pull them down when a matching Box locks into the front row.

The Final Clean-Up in Marble Sort Level 15

The back rows are highly concentrated. You just need to sequence the final pulls without overlapping too many colors.

Clear the secondary Dark Blue blocks deep in Column 1 and Column 5.
Feed the Green marbles straight down the middle. They are stacked heavily in Column 3 and Column 4 near the top.
Dump the final Red and Yellow blocks from the absolute highest rows.

Patience is everything at the end. Keep your eyes on the Conveyor Belt space. Let the animations finish, verify your active Box, and make the final taps to close out the level.

Marble Sort Level 15 Walkthrough Solution | Marble Sort 15