Marble Sort Level 15 baits you into filling the belt with colours you can't use. Dark Blue, Orange, and Light Blue dominate the start. The tray is a huge block, five columns wide and narrowing at the top, and dead centre sits a grey countdown obstacle stamped with a 3 — you need three bottom clears before that centre path opens.
The front row of the tray runs Red, Orange, Orange, Light Blue, Purple. Your four active Boxes are Dark Blue, Light Blue, Dark Blue, Orange. Spot the trap: there is zero Dark Blue in the playable front row, yet two Dark Blue Boxes are begging for it. You have to dig, and you can't blind-dig because the belt only holds seven slots.
Marble Sort Level 15 Walkthrough
The columns are stacked against you. Column one is capped by Red (then Purple, Light Blue, Dark Blue) — pure bait. Column two is capped by Orange and hides Dark Blue behind it. Column three is capped by Orange and hides Light Blue. Column four is capped by Light Blue and hides Red. Column five is capped by Purple (then Yellow, then Dark Blue) — more bait. The outer Red and Purple have no matching Boxes, so tapping them crowds the belt. You must work the centre three columns.
How to Beat Marble Sort Level 15 — Step-by-Step
First taps and the Orange bait
- Tap the Orange in column two.
- Tap the Orange in column three. Together they clear the active Orange Box in lane four — first clear.
- Tap the front Light Blue in column four.
- Tap the newly exposed Light Blue in column three into lane two's Light Blue Box — second clear.
- Column two's Dark Blue is now exposed. Tap it into lane one's Dark Blue Box — third clear.
- Three clears, and the centre 3-counter drops to zero. The board's identity changes.
Survive the midgame shift
- The next layer of Boxes pushes up, revealing Purple and Red demands. Now the outer columns matter.
- Tap the Purple in column five into the newly revealed Purple Box.
- Tap the Red in column one into the active Red Box.
- That exposes a deeper Light Blue in column one. Drop it into the next Light Blue Box that rotates in.
- Leave the Yellow and Green in the middle rows alone until their Boxes lock into the front row — pulling them early bricks the level.
The final cleanup
- Clear the secondary Dark Blue blocks deep in columns one and five.
- Feed the Green straight down the middle — they're stacked in columns three and four.
- Dump the final Red and Yellow from the highest rows.
- Let the animations finish, verify each active Box, and close it out.
Tips & tricks
- The centre three columns are your entire early game — the outer Red and Purple are traps.
- Count your clears out loud: Orange, Light Blue, Dark Blue is the exact three you need.
- Seven belt slots is all you have, so every off-colour pull has to be deliberate.
Common mistakes
- Tapping the outer Red or Purple early. Neither has a Box, so both crowd the belt instantly.
- Dropping the midgame Yellow or Green before their Boxes surface — a guaranteed brick.
Marble Sort Level 15 FAQ
Why does my Conveyor Belt flood on Marble Sort Level 15?
You tapped the outer Red or Purple column before any matching Box was active. With only seven belt slots, they crowd it instantly. Work the centre three columns instead.
Which color do I clear first on Marble Sort Level 15?
Orange, in columns two and three. Clearing them feeds lane four and is the first of the three clears you need to unlock the centre counter.
How many moves does it take to clear Marble Sort Level 15?
Around eleven taps across three phases — the three-count Orange, Light Blue and Dark Blue clears, the midgame Purple and Red shift, then the final Green and Red cleanup.
Do I need boosters to beat Marble Sort Level 15?
No. Hit three centre clears to open the counter and the board unlocks itself. Save boosters for boards with hidden Boxes or locks.
What happens if I tap the outer Red or Purple early?
Those marbles hit the Conveyor Belt with no Box to catch them and crowd your seven slots, jamming the run before you can reach the Dark Blue.
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