Marble Sort Level 187 — Walkthrough and Solution

Level 187 is the lock and key trap. The key is buried on the right, but the White marbles up front are a decoy that will jam your belt if you touch them too soon.

Level187
DifficultyMedium
Priority routeOrange → Light Blue
Watch forOrange

▶ Video walkthrough of Marble Sort level 187, then the step-by-step below.

⚡ Quick clear

Orange → Light Blue. The lock won't open without its key.

Marble Sort Level 187 is a puzzle of restraint and precision. The board is locked until you retrieve a special key, and the opening moves set the tone for the entire stage. The correct approach is to ignore the tempting White marbles on the left, focus on the central and right columns, and only after the lock opens, address the side tunnels.

The layout features a top tray with a locked row across the top. The active pool below shows a dense mix: Orange, Light Blue, Light Green, Yellow, and White are visible in the front. Four tunnels line the sides — two on the left and two on the right — each marked with a number "2", indicating hidden blocks that will release later. The bottom boxes start with Orange, Light Blue, Light Green, and another Light Blue in the front row. The top tray's front row holds White, Yellow, Orange, Light Blue, and Light Green from left to right.

Marble Sort Level 187 Walkthrough

The bottom boxes in the first row demand Orange, Light Blue, Light Green, and Light Blue again. The top tray's front row has White on the far left, followed by Yellow, Orange, Light Blue, and Light Green. The trap is the White marble: it sits in the front, but the matching bottom box for White is buried deep on the left side. If you send White down early, it will occupy a belt slot while you still need to free other colors.

The key to the lock is on the right side of the central cluster, sitting on top of a Yellow block. You must carve a path through the yellow marbles to reach it.

How to Beat Marble Sort Level 187 — Step-by-Step

Phase one: Clear the front line without touching White

  1. Tap the Orange marble in the middle of the top tray's front row.
  2. Tap the Light Blue marble immediately to its right.
  3. Tap the Light Green marble on the far right of that front row.
  4. These three drops fill the matching bottom boxes, clearing the first row.
  5. After that, three Yellow boxes slide forward in the bottom tray.
  6. Now grab the Yellow marbles from the left side of the top tray's front row.
  7. Keep pulling Yellow from the central mass, working toward the right side.
  8. Expose the Yellow block that holds the key.
  9. Tap that block to drop it into the remaining Yellow box.

Phase two: Unlock the top row and manage the tunnels

  1. Once the key is used, the top row opens, releasing Light Blue, Dark Blue, Green, Orange, and Red.
  2. Simultaneously, the side tunnels begin pushing new blocks toward the belt.
  3. Examine the new bottom boxes: Purple appears on the right side.
  4. To get Purple, tap the right-side tunnels carefully. Do not over-tap, as each tunnel hides multiple blocks.
  5. Now that the right side is partially cleared, address the White marbles that were left alone earlier.
  6. The White bottom box on the left should be exposed or nearly exposed.
  7. Drop the White marbles from the top left to fill that box, clearing a large portion of the left side.
  8. Then send down the Dark Blue marbles that unlocked from the top row.
  9. Monitor the tunnel counters: when a tunnel shows "1" or "0", it is safe to clear it.
  10. Clear the left tunnels to match the remaining Light Green and Pink marbles.

Phase three: Final assembly

  1. Use the open belt slots to hold Red and Pink marbles while the last Light Blue box slides into position.
  2. Fill the Light Blue box with the Light Blue marbles from the unlocked top row.
  3. Clear any remaining side blocks systematically.
  4. Keep the belt free of more than three unmatched marbles at any time once the tunnels are active.

Tips & tricks

  • Do not tap White at the start; it is a decoy that will clog the belt.
  • When pulling from tunnels, tap once and wait to see the result before tapping again.
  • Use the Yellow window to dig straight toward the key without diverting to other colors.
  • Keep an eye on the tunnel numbers to avoid unexpected block releases.

Common mistakes

  • Sending White down early, which blocks the belt and delays progress.
  • Spamming the side tunnels, causing a flood of unwanted blocks.
  • Ignoring the key's location and wasting moves on the left side.

Marble Sort Level 187 FAQ

Why does my Conveyor Belt flood on Marble Sort Level 187?

The belt floods if you tap White early or over-tap the side tunnels, which releases more blocks than you can process.

Which color do I clear first on Marble Sort Level 187?

Clear Orange, Light Blue, and Light Green from the front row first, avoiding the White marbles until later.

How many moves does it take to clear Marble Sort Level 187?

There is no fixed move count, but an efficient run usually takes around 40–50 taps.

Do I need boosters to beat Marble Sort Level 187?

No boosters are necessary; careful sequencing and tunnel management are enough.

What happens if I tap White early on Marble Sort Level 187?

Tapping White early fills a belt slot with a marble that has no immediate match, causing congestion and potentially forcing you to restart.

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