Marble Sort Level 690 Walkthrough Solution | Marble Sort 690

Marble Sort Level 690 Guide: The Center Lock and Mystery Box Trap

Marble Sort Level 690 is an absolute beast of a puzzle. You load in and immediately face a massive center padlock locking down the entire middle of the board. The dominant colors here are bright yellows, blues, stark whites, and greens, but you cannot reach most of them early on.

The Top Tray is heavily restricted. The outer edges are lined entirely with Mystery Boxes—those gray blocks stamped with question marks. This means you are flying blind if you clear the wrong path. Meanwhile, the bottom Boxes feature an ugly set of Connected Boxes early on, forcing you to manage double clears while your Conveyor Belt space vanishes rapidly. One wrong release in the opening seconds will jam your belt and end the run.

The Central Trap Pattern in Marble Sort Level 690

Look closely at how this specific board is stacked. The Top Tray is divided by two massive vertical yellow sliding latches and a heavy central chain. Do not try to brute-force the outer columns. It will not work.

The master key to that center lock is sitting directly on a lower box in the middle-right cluster. It has a small orange key icon on it. Until you hit that Lock and Key mechanic, the best parts of the board are dead weight.

In the lower section, your initial bottom Boxes are arranged perfectly to bait you. The front row gives you Purple, Yellow, White, and Light Blue. Right behind the Purple box on the far left, you have a pair of pink Connected Boxes tied together with a black barbell line. This is a massive trap. You might think clearing that left side early is smart to open space. It isn't. Those connected boxes will drop together and demand a huge amount of matching pink marbles instantly. If your Conveyor Belt is already holding random colors from the top tray’s Mystery Boxes, those connected ones will jam you up permanently.

Deep in the bottom tray stack, you will also face an Arrow Box. A black line connects a central pink box to a green box on the right. You cannot activate that target green box until the anchor box drops. Order is everything on this board.

Marble Sort Level 690 Step-by-Step Walkthrough

Follow this exact release sequence. Space management on the Conveyor Belt is your only lifeline here.

Opening Moves and Key Retrieval in Marble Sort Level 690

The first taps dictate your survival. Leave the Mystery Boxes on the upper left and right completely alone.

1. Focus completely on the front row of the bottom Boxes: Purple, Yellow, White, and Light Blue.
2. Look at the exposed marbles in the center of the Top Tray. You have visible yellow and white marbles sitting right below the lock. Route the yellow marbles first to clear the front-row Yellow Box.
3. Clear the white marbles next to feed the front-row White Box.
4. Dig down the middle-right column. Your immediate goal is to expose and clear the box holding the orange key.
5. Hold off on releasing any pink marbles from the top. The left side of your bottom area hides those pink Connected Boxes. If you bring them forward too early, they will clog the Conveyor Belt.
6. Clear the key box. The center padlock snaps. The massive yellow side latches slide away. The board is now cracked open.

Managing Mystery Boxes and Connected Boxes in Marble Sort Level 690

Breaking the lock opens the floodgates. Suddenly the middle columns are heavily exposed. But Marble Sort Level 690 gets extremely dangerous right here.

1. The center drop reveals a bunch of blue, light green, and red marbles. Now you must finally deal with the left side of the bottom tray.
2. Prep your Conveyor Belt. You must have at least four empty slots before you drop the pink Connected Boxes into the active front row.
3. Tap the matching pink marbles from the newly opened center area to feed those Connected Boxes. Clear them fast to get them out of your way.
4. Start testing the outer Mystery Boxes. Only tap one question mark at a time. If it reveals a color you do not currently have an active bottom Box for, leave it sitting in the Top Tray.
5. Never tap three Mystery Boxes in a row. If they dump three different dead colors onto the belt, your run is mathematically over.

Defeating the Arrow Box and Final Cleanup in Marble Sort Level 690

As you push into the late game, the board shifts. The top tray will reveal massive 9-capacity marble blocks in bright cyan, pink, and green.

1. The Arrow Box reveals itself on the bottom tray. It ties a crucial central box to a green box on the right side.
2. You must clear the anchor box first. Route all available matching marbles into the active box at the base of the arrow line. Ignore the green marbles up top for now.
3. Once the anchor clears, the target green box finally activates. Now you can release the heavy clusters of green marbles from the top tray.
4. Feed the remaining 9-capacity blocks into the final bottom Boxes. With the Arrow Box dismantled and the center completely hollowed out, the final sequence is just basic cleanup. Keep your belt clear, match the large blocks, and you will beat the level.