Marble Sort Level 15 Walkthrough & Solution

Level 15 Board Overview: The Missing Dark Blue Problem

Level 15 greets you with a fat block of a Top Tray — five columns wide, tapering toward the top — painted mostly in Dark Blue, Orange, and Light Blue. A gray countdown tile stamped with a 3 sits dead center in the upper rows, and it wants three Box clears before the middle of the board opens.

Here is the catch. The front row of the tray reads Red, Orange, Orange, Light Blue, Purple. Your four active bottom Boxes want Dark Blue, Light Blue, Dark Blue, and Orange. Line those two lists up: there is no Dark Blue anywhere you can actually tap, and two Boxes are begging for it. The colors you need are buried under the colors you have.

Your Conveyor Belt has seven slots. Sounds generous. It is not — the outer columns are loaded with bait that would love to fill them.

The Trap in Marble Sort Level 15

The column layout tells you exactly where the level is trying to hurt you:

• Column 1 (far left): Red on top, with Purple, Light Blue, and Dark Blue stacked behind. Nothing here matches an active Box. Touching it early floods the belt.
• Column 2: Orange on top, and this is the important one — Dark Blue is hiding directly behind it.
• Column 3 (center): Orange over Light Blue. Both have homes right now.
• Column 4: Light Blue over Red. The Light Blue feeds lane 2.
• Column 5 (far right): Purple over Yellow over Dark Blue. Same trap as column 1 — leave it alone at the start.

So the play writes itself: work the middle three columns. The Orange and Light Blue caps in columns 2, 3, and 4 all match live Boxes, and clearing them digs out the Dark Blue that lanes 1 and 3 are starving for. Every clear also ticks the center counter toward zero.

Marble Sort Level 15 Step-by-Step Walkthrough

The opening is a fixed sequence. Three fast clears flip the whole board.

Opening: three clears to unlock the center

1. Tap the Orange marbles in column 2.
2. Tap the Orange marbles in column 3. Together they fill the Orange Box in lane 4 — clear number one.
3. Tap the Light Blue marbles at the front of column 4.
4. Tap the Light Blue marbles you just exposed in column 3. They land in the Light Blue Box in lane 2 — clear number two.
5. Column 2 is now showing Dark Blue. Tap it straight into the Dark Blue Box in lane 1 — clear number three. The center counter hits zero and the board changes personality.

Mid-game: the outer columns wake up

The inner core is yours now, and the next row of Boxes pushes up asking for Purple and Red — the exact colors capping those bait columns you ignored.

6. Tap the Purple marbles in column 5 on the far right into the new Purple Box.
7. Tap the Red marbles in column 1 on the far left into the active Red Box.
8. Drop the Light Blue block that was buried in column 1 — a Light Blue Box rotates in to catch it.

One warning for this stretch: Green and Yellow marbles start showing in the middle rows. Do not touch them yet. Pulling the Yellow from column 2 or the Greens from column 3 before a matching Box locks in is how this level bricks.

Cleanup: sequence the back rows

The rear of the tray is dense but harmless if you pull one color at a time.

9. Clear the deep Dark Blue blocks at the bottom of columns 1 and 5.
10. Feed the Green marbles stacked near the top of columns 3 and 4 down the middle.
11. Dump the last Red and Yellow blocks from the highest rows. Watch the belt, let each animation finish, and take the win.

Level 15 Tips Recap

• Two Dark Blue Boxes and zero visible Dark Blue means the opening is a dig, not a match.
• Columns 1 and 5 are bait until the second row of Boxes arrives — patience beats speed here.
• Green and Yellow stay frozen until their Boxes are on screen. Tap early and the belt dies.