Marble Sort Level 687 Walkthrough Solution | Marble Sort 687

Marble Sort Level 687 Guide: The Arrow Box Gridlock Trap

Stuck on Marble Sort Level 687? I get it. This board is an absolute nightmare of hidden information and tight spaces. You load in and immediately face a massive diamond-shaped grid dominating the Top Tray. The entire center is completely choked by grey Mystery Boxes.

You have pink and light blue marbles chilling on the far left and right edges. Do not touch them yet. They are pure bait.

The real threat here is the directional lock. You have a brutal chain of Arrow Boxes pointing right into the center, feeding directly into the grey blocks. Meanwhile, your bottom Boxes start off demanding a very specific mix of Light Pink, Red, and Yellow. If you pull the wrong outer pieces too early, your Conveyor Belt will completely jam before you even crack the middle of the board.

The Arrow Box gridlock in Marble Sort Level 687

This layout is incredibly strict. The Top Tray forces you into a very tight opening sequence. The game absolutely wants you to make a mistake early.

Look at the outer edges of the board. On the left side, a pink Arrow Box points straight up. Beside it, a white Arrow Box points right. Next to that, a yellow one points right again. Above them, a light green Arrow Box points down. On the right side of the board, the light purple Arrow Box points up, while the dark purple and blue Arrow Boxes point left to trap the center. You cannot bypass this defensive frame.

Your starting lower Boxes are hungry for Light Pink, Red, and Yellow marbles. Look at the very bottom of the Top Tray. You have three exposed Boxes sitting there acting as anchors: one light green on the left, and two red ones next to it.

The trap is your Conveyor Belt. It looks perfectly safe and empty right now. It will not stay that way. If you trigger the outer pink or light blue marbles, they will drop down, sit on the belt, and rot. You do not have the matching bottom Boxes to clear them yet.

Look closely at your lower Boxes. They are stacked deep. The first column hides green and white underneath the initial Light Pink. The fourth column is a massive, solid vertical stack of red bottom Boxes. This tells you immediately that red is a high-volume clearance color for this run.

Every single move in the first phase must focus on peeling back the Arrow Box layers. You have to reveal the Mystery Box cluster in the middle. Once that center cracks open, the lower Boxes will shift heavily into green and purple.

Marble Sort Level 687 Step-by-Step Walkthrough

Escaping the early gridlock in Marble Sort Level 687

You have to play with surgical precision here. One careless tap ends the run. Your first few moves dictate the entire flow of the board.

1. Check your active bottom Boxes. You need Light Pink, Red, and Yellow immediately.
2. Focus on the bottom center of the Top Tray. Release the marbles sitting on those exposed red Boxes first. This will feed that massive red stack in the fourth column of your lower Boxes.
3. Ignore the far-left pink marble. Ignore the far-right light blue marble. Leaving them alone saves vital space on your Conveyor Belt.
4. Start working the Arrow Box chains from the inside out. Look for the arrows pointing outward or downward that are currently unblocked by other marbles.
5. Carefully tap the yellow and light green marbles sitting near the top of the Arrow Box loops. Only drop them if you have a yellow bottom Box active, or if you have exactly enough empty slots on the belt to hold them temporarily.
6. Clear the first Light Pink bottom Box in column one. This drags the rest of the left side down and reveals the green bottom Boxes you desperately need.

Managing the mid-board chaos in Marble Sort Level 687

Once you clear the first wave, the game flips the script. The middle opens up. The danger goes through the roof.

1. The center Mystery Boxes will start turning into playable colored Boxes. Watch them closely as they flip. They heavily skew towards green, purple, and dark blue.
2. Look at your lower Boxes now. The left columns will transition into bright green and orange. The right columns will expose purple and thick, knitted-texture bottom Boxes.
3. Watch your Conveyor Belt space like a hawk. It is extremely easy to end up with a terrifying rainbow of death—getting purple, dark blue, red, light blue, white, and yellow all stuck on the belt at once. If you let the belt fill up with this mix, you are dead.
4. Target the bright green marble sitting on the red box in the upper middle area. Dropping this unlocks the upper layer of the Mystery Box grid and gives you breathing room.
5. Clear the purple and blue Arrow Boxes on the right side only when a purple bottom Box is completely exposed and ready to receive them.
6. Funnel your green marbles into the bottom left. There is a massive stack of green bottom Boxes waiting to be fed, and clearing them is the absolute key to surviving the mid-game.

Clearing the final Mystery Boxes in Marble Sort Level 687

The late game is all about cleanup, patience, and not panicking at the finish line.

1. You will have a few stubborn Mystery Boxes left near the top of the Top Tray. Prioritize matching whatever colors they reveal immediately so they do not block your final moves.
2. Do not leave single, odd-colored marbles stranded on the Conveyor Belt. If a stray white or yellow marble drops from a newly opened box, find its match instantly.
3. The final bottom Boxes will likely be those thick, textured ones on the far right. Save your remaining top-corner marbles to fill these exact spots.
4. Keep the belt clean. Feed the final red and blue matches into their respective bottom Boxes to finally clear the board.