Marble Sort Level 686 — Walkthrough and Solution

Marble Sort Level 686 is a triple Lock and Key puzzle where three vertical tracks block the upper pyramid, which is packed with dark grey Hidden Boxes. The winning order is to feed the front bottom Boxes with Orange and Yellow only, skip the Red pieces near the funnel until the third row activates, and then unlock each key by clearing the colors underneath. This prevents the Conveyor Belt from choking and lets you clear all marbles without boosts.

The board has a stepped pyramid Top Tray. At the bottom of that tray, directly over the chute, sit three textured boxes: Red on the left, Light Pink in the middle, and Red on the right. Behind them, a wall of accessible boxes shows Purple on the upper left, Yellow next to it, Orange in the center-right, and Light Pink on the far right. The receiving area has three rows of bottom Boxes. The front row demands exactly two Orange (left and third) and two Yellow (second and fourth). The second row asks for Light Pink, Purple, Yellow, and Light Pink from left to right. The third row contains Red on the left and Purple on the right. Three Lock and Key columns run down the middle and sides; the left key sits above a Red mix, while the middle and right keys each sit above an Orange column.

Marble Sort Level 686 Walkthrough

The front row of bottom Boxes is strictly Orange, Yellow, Orange, Yellow. The second row behind it is Light Pink, Purple, Yellow, Light Pink. The third row hides Red and Purple. These demands dictate every move.

The specific trap is the three textured boxes near the funnel: Red, Light Pink, and Red. They look easy to tap, but the front row only wants Orange and Yellow. If you drop those Red marbles early, they will roll onto the Conveyor Belt, which has very little space. That causes a jam you cannot fix.

How to Beat Marble Sort Level 686 — Step-by-Step

Phase one: Bypass the opening decoy

1. Leave the Red boxes untouched—they are a decoy.
2. Tap the available Yellow on the far left of the Top Tray and guide it down to clear the first Yellow slot.
3. Route the Orange from the center-right to the first Orange slot.
4. Feed the second Yellow from the right side to the second Yellow slot.
5. Deliver the Orange from the middle to the second Orange slot, clearing the entire front row.
6. Now the second row activates, so tap the Light Pink box near the funnel and drop it to the left Light Pink slot.
7. Pull Purple from the upper left to the Purple slot.
8. Clear the Yellow from the right side to the Yellow slot.
9. Drop the last Light Pink from the far right to the right Light Pink slot, finishing the second row.

Phase two: Unlock the keys

1. With the second row gone, the third row shows Red on the left and Purple on the right. Now you can safely tap the Red box that was near the funnel and send it to the left Red slot.
2. Grab the Purple from the upper middle and drop it to the right Purple slot, clearing the third row.
3. Now the bottom Boxes are all gone, so focus on the Lock and Key tracks. The left key sits above a Red mix; clear the Red boxes under that track to drop the key and unlock the left section.
4. Immediately dive into the newly opened left area to reveal dark grey Hidden Boxes with question marks.
5. As Hidden Boxes flip, they may show Orange, Yellow, or Purple. Match them to the newly active bottom Boxes, which now appear as a fourth row. Keep the belt clear.
6. Next, clear the Orange boxes under the middle key track to release that lock.
7. After the middle unlocks, open that section and pull any needed colors, especially Purple and Light Pink, to satisfy the new bottom Boxes.
8. Finally, clear the Orange under the right key track to drop the third key.
9. Enter the right unlocked zone and reveal more Hidden Boxes, matching them to the remaining bottom Box demands.

Phase three: Clear the upper pyramid

1. The top of the pyramid is now accessible, packed with consecutive Hidden Boxes.
2. Tap one Hidden Box at a time. If it reveals a color that matches an open bottom Box, drop it immediately.
3. If it reveals an unwanted color, leave it in the Top Tray—do not send it down just to see behind it.
4. Work through the deep lower columns, which ask for more Orange, Light Pink, and Yellow.
5. Keep the Conveyor Belt empty at all times. If a marble sits there too long, it blocks the path.
6. Continue revealing and matching until the last Hidden Box is cleared and the board empties.

Tips & tricks

• Always check the bottom Boxes before tapping anything in the Top Tray. Only drop colors that are currently needed.
• When a Lock and Key unlocks, clear the entire new section quickly, as it often contains colors that the next bottom row needs.
• Treat the Conveyor Belt like a buffer: never let it hold more than one marble, and always clear it before making another drop.

Common mistakes

• Tapping the Red boxes near the funnel early, which jams the belt.
• Revealing Hidden Boxes without checking if the color is needed, forcing you to leave them on the belt.
• Ignoring the Lock and Key tracks until the bottom rows are cleared, which delays access to crucial colors.

Marble Sort Level 686 FAQ

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