Marble Sort Level 87 Walkthrough Solution

Marble Sort Level 87 Guide: The Lock and Key Chain Trap

Stuck on this one? I get it. Marble Sort Level 87 is incredibly frustrating because the game aggressively limits your opening moves. The entire left side of the board is held hostage by a massive vertical chain. You cannot touch those left-side columns until you dig through a messy right-side grid to find the key.

Worse, the starting colors available on the board do not match the colors your bottom Boxes actually want. You are forced to push your Conveyor Belt to the absolute limit right from the very first tap. If you just start clicking whatever is free at the bottom of the Top Tray, you will jam the belt and fail before you even unlock the chain. Let’s break down exactly how to navigate this exact layout.

The Brutal Board Layout in Marble Sort Level 87

You need to understand how this specific grid is stacked to avoid the early game over. The Top Tray is completely cut in half.

On the far left, you have two columns sitting under a Tunnel marked with a "3". Right below that tunnel are solid Pink and Yellow blocks. You can ignore them completely at the start. A giant padlock and chain separate this left section from the rest of the board. The Lock and Key mechanic defines this whole level. You have to find the key to drop the chain.

The right side is your only starting path. But look at the bottom row of blocks available to you. From left to right: Pink, a Red bubble-textured block, a Light Blue bubble-textured block, and a Purple bubble-textured block.

Now look at your bottom Boxes. The top row demands Light Green, Light Green, Dark Blue, and Orange.

They don't match. Not even close. This is a massive trap.

The game wants you to panic and tap those bottom Red, Light Blue, and Purple blocks just because they are accessible. Do not do it. If you drop them, they will sit on your Conveyor Belt forever because the bottom Boxes for those colors are buried deep in rows two, three, and four.

Instead, look slightly higher up on the right side. Above the Purple block is a Light Green block. Above the Light Blue block is a Purple block. Above the Red block is an Orange block. Further up, sitting right below the massive 3x3 grid of question marks (the Hidden Box area), you will see the golden key shining. That is your target. You have to carefully use the Conveyor Belt as a temporary waiting room for the bottom blocks so you can snipe the exact colors your top Boxes demand.

Marble Sort Level 87 Step-by-Step Walkthrough

Follow this release order exactly. Control the Conveyor Belt and do not pull blocks you cannot immediately clear.

Dodging the First Color Trap in Marble Sort Level 87

Your first goal is to clear the top row of bottom Boxes (Light Green, Light Green, Dark Blue, Orange) without causing a permanent traffic jam.

Drop the Purple block: Tap the Purple bubble-textured block on the far right. Let it sit on the Conveyor Belt. This exposes the Light Green block above it.
Clear the first Box: Tap that newly exposed Light Green block. Send it to the top-left bottom Box. This gives you an early clear and keeps the belt from filling up.
Drop the Light Blue block: Tap the Light Blue bubble-textured block in the second-to-last column. Send it to the belt. Do not touch the Red block yet.
Expose the Orange: Now that the Light Blue block is gone, you have access to the blocks above it. You are trying to dig toward the top-right column to reach the Orange and Dark Blue blocks hiding near the Hidden Box grid.
Clear the Orange Box: Once you expose the Orange block, drop it into the bottom-right Box. Clearing this opens up a new slot in the lower tray, which usually reveals a need for Light Blue or Dark Blue.
Match the Belt: Now that the second layer of bottom Boxes is opening up, you will see demands for Light Blue and Dark Blue. Use the Light Blue block currently rotting on your Conveyor Belt to clear the next Box. This relieves the pressure.

Unlocking the Chain in Marble Sort Level 87

Once you survive that ugly opening mismatch, your sole focus shifts to the upper right corner of the Top Tray. You must break the chain before the board runs out of playable moves.

Dig into the Hidden Box grid: You will see a large section of nine question marks. The golden key is located on the right side of this cluster. Start pulling blocks right beneath the key.
Clear the Key: Once you drop the block containing the key down to the bottom Boxes, the massive vertical chain in the middle of the board will shatter.
Pivot to the left side: The second the chain drops, the entire left side of the Top Tray becomes active. You now have immediate access to the Pink and Yellow blocks sitting under the left-side Tunnel.
Assess the new Box demands: Look at your bottom Boxes. Digging through the first two rows likely revealed demands for Pink, Yellow, and Brown. Use your newly unlocked left-side columns to feed these boxes instantly.

Managing the Final Tunnels in Marble Sort Level 87

The late game turns into a pure space-management puzzle. Both sides of the board have a Tunnel that holds multiple blocks.

Do not pull from Tunnels blindly: When a Tunnel drops from a "3" to a "2", it spits out a new block. In the late stages of this board, you will see a mess of Yellow, Pink, Light Blue, and Purple bubble-textured blocks dropping down.
Wait for the exact Box: Only tap a block from under a Tunnel if the matching bottom Box is currently active and empty. If you pull a Yellow block from the left Tunnel while the active bottom Boxes only want Purple and Light Green, you will fatally clog the Conveyor Belt.
Clear the bubble blocks: Focus heavily on clearing the textured bubble blocks first. They take up a massive amount of visual space and block the final required colors. Route the left-side Yellows into the second-row Yellow Box, then quickly pivot to the right side to clear the remaining Pink and Light Blue blocks.
Empty the Belt: Keep your eyes glued to the Conveyor Belt. If you have three different colors sitting on it, stop pulling. Find a way to clear one of those three colors into a bottom Box before you touch the Top Tray again. Once the final hidden blocks fall from the Tunnels, just match the remaining colors to finish the level.

Marble Sort Level 87 Walkthrough Solution | Marble Sort 87