Marble Sort Level 688 Walkthrough Solution | Marble Sort 688

Marble Sort Level 688 Guide: The Lock and Key Mystery Trap

Marble Sort Level 688 throws a nasty mix of mechanics right in your face. You are staring at a massive cluster of gray Mystery Boxes on the left side and a thick wall of Iced Boxes dominating the right. The dominant colors you need to worry about early on are Pink, Brown, Red, and Orange.

Right at the very top of the Top Tray, you will see a massive golden lock holding back four crucial keys: Light Blue, Green, Pink, and Orange. You cannot reach them until you clear the garbage at the bottom. The bottom receiving Boxes start by demanding Blue, Brown, Purple, and Orange. This creates an immediate mismatch. The board wants you to panic and fill your Conveyor Belt with colors you cannot use. Do not take the bait.

The divided grid pattern in Marble Sort Level 688

This board layout is designed to choke your space instantly. A massive, impassable red cross-shaped block sits dead center in the Top Tray. It completely divides the left and right sides of the puzzle.

On the left side of that cross, you have a solid 7-block cluster of Mystery Boxes. You have no idea what colors are hiding in there. On the right side, a block of Iced Boxes traps several colors, with Black, Red, Pink, and Light Blue barely visible through the frost.

The front row of the Top Tray gives you a very specific set of available marbles: Pink, Brown, Red, Orange, Black, and another Red. Now look directly down at your front row of bottom Boxes. The game is asking for Blue, Brown, Purple, and Orange.

This is where the trap snaps shut. You have Brown and Orange ready to go. You do not have Blue or Purple available on the front lines. There is a single Blue marble sitting immediately behind the front-left Pink marble. To get that Blue, you have to put Pink on your Conveyor Belt. But your bottom Pink Box is buried underneath Orange in the far right column.

If you just start clicking whatever is free, your Conveyor Belt will fill up with useless Red, Black, and Pink marbles. Once you start opening the Mystery Boxes on the left, the pressure gets worse. Every reveal could be a color you do not have a bottom Box for yet. The key to surviving this layout is extreme patience with your belt space.

Marble Sort Level 688 Step-by-Step Walkthrough

Follow this specific order to safely dismantle the barriers without jamming your belt.

Surviving the opening bait in Marble Sort Level 688

Your first taps decide if you win or lose. You have to clear what you can, then take a calculated risk to reach the hidden colors.

1. Tap the front-row Brown marble. It drops straight into the second bottom Box and begins clearing it.
2. Tap the front-row Orange marble. It matches the fourth bottom Box.
3. Leave the front Red and Black marbles alone. They are pure bait right now. Do not touch them.
4. You desperately need Blue to clear the first bottom Box. Tap the front-left Pink marble to drop it onto your Conveyor Belt. It will sit there, but it opens the path to the Blue marble directly behind it.
5. Tap the newly exposed Blue marble to start filling the first bottom Box.
6. Now you need Purple for the third bottom Box. The only Purple available is trapped behind the Iced Boxes on the right side. You must start breaking the ice.

Cracking the frozen right side in Marble Sort Level 688

Once you handle the immediate Blue and Brown clears, the board opens up slightly. Your next major hurdle is thawing out the right side of the Top Tray.

1. Look at the lower Iced Boxes. You will see a frozen Black and a frozen Red marble.
2. Use the front-row Black and Red marbles to create matches near the ice. Dropping these pieces will crack the Iced Boxes and slowly thaw the marbles inside.
3. Keep your eyes on the bottom Boxes. As the front row clears, the second row pushes up. You will soon see demands for Red, Orange, and Brown.
4. Once the ice breaks, grab the Purple marble that was hiding behind it. Send it straight into the third bottom Box.
5. With the front line of bottom Boxes cleared, the board breathes. Now turn your attention to the left side. Tap the lowest Mystery Box.
6. Whatever color pops out of the Mystery Box, check your bottom Boxes immediately. If you have a match, send it down. If you don't, leave the other Mystery Boxes alone until your Conveyor Belt has at least three empty slots.

Unlocking the final top section in Marble Sort Level 688

By now, the central cross barrier is completely exposed. You have cleared the bottom half of the Top Tray. The only things left are the Lock and Key setup at the top and a lone Key Box on the far upper right.

1. Target the upper-right Key Box first. It is usually a brown or orange marble depending on your earlier drops. Clear it to activate the first key sequence.
2. The giant golden lock will finally click open. This frees the cluster of Light Blue, Green, Pink, and Orange keys at the very top.
3. At this stage, your bottom Boxes will be rapidly cycling through secondary colors. Prioritize clearing the Light Blue and Green marbles, as they have been blocking the top-left corner all game.
4. Clear the remaining keys to unlock any final hidden columns.
5. Sweep the rest of the board. Keep your belt clean. You survived the jam.