Marble Sort Level 668 Walkthrough Solution | Marble Sort 668

Marble Sort Level 668 Guide: The Double Tunnel and Arrow Box Trap

This board is a masterclass in bait. Marble Sort Level 668 throws a massive amount of easily accessible White and Light Green marbles at you right from the start. It looks like an easy opening. It is absolutely a trap.

The dominant colors you need to worry about early on are Dark Blue, Light Green, White, and Pink. The Top Tray is heavily structured. A huge pyramid of grey Hidden Boxes sits at the very peak, completely blocking the late game. Below that, two massive 2x2 striped Tunnels dominate the center of the board, hoarding the colors you will desperately need in the midgame.

The bottom Boxes are where the real threat lies. The opening front row is Light Green, Pink, Dark Blue, and White. But right behind that Dark Blue sits a pair of Connected Boxes. This obstacle controls the entire first phase. If you do not manage your Conveyor Belt perfectly to break that connected pair, the level is over before it really begins.

The Double Tunnel pattern in Marble Sort Level 668

To beat this board, you have to understand exactly how the layers are stacked against you.

Look at the front lip of the Top Tray. You have a solid wall of marble clusters sitting completely exposed: White, Light Green, White, Dark Blue, Light Blue, White, Light Green. Because the front row of bottom Boxes needs Light Green and White, your brain immediately wants to tap all of these clusters. Don't do it.

Your Conveyor Belt has strictly limited space. If you blindly tap all the White and Light Green clusters, you will pull down colors you cannot process yet. The Light Blue cluster sitting on that front lip is pure bait. There is no Light Blue bottom Box in the starting front row. If you tap it, it just sits on the Conveyor Belt eating a vital slot.

The critical path goes right through the center. Wedged perfectly between the two large Tunnels is a vertical stack holding Dark Blue. You need this. The third bottom Box from the left is Dark Blue. Immediately behind it are two more Dark Blue Boxes tied together as Connected Boxes. This means you need a massive amount of Dark Blue marbles to clear that column and open up the rest of the board.

Once you clear that initial wave, the board identity completely flips. The lower Boxes shift and a web of Arrow Boxes appears. These boxes have strict black lines connecting them. You cannot even begin to fill a tied box until the specific box it points to is completely cleared. The midgame becomes a rigid puzzle where order is everything, and one stray tap from a Hidden Box will instantly jam your belt.

Marble Sort Level 668 Step-by-Step Walkthrough

You need a strict release order to survive the opening chokepoint. Follow this sequence to keep your belt clear.

Beating the Connected Box Trap in Marble Sort Level 668

The opening moves are all about clearing the front row without touching the bait colors.

1. Tap the exposed Light Green and White marble clusters on the very front edge of the Top Tray. Feed them directly into the first and fourth bottom Boxes.
2. Leave the Light Blue cluster alone. Do not touch it.
3. Tap the Pink cluster located in the left Tunnel to clear the second bottom Box.
4. Focus entirely on the center gap between the Tunnels. Pull the Dark Blue clusters from that middle column.
5. Fill the front Dark Blue bottom Box.
6. The moment that front box clears, the double Dark Blue Connected Boxes will slide forward. Feed them immediately. You must clear these connected heavyweights before you try to process anything else.

Surviving the Arrow Box Shift in Marble Sort Level 668

Once you break through the first major layers, the bottom tray updates and the Arrow Boxes take over. The game now dictates exactly what you are allowed to play.

1. Trace the black lines on the bottom Boxes. Find the "root" boxes that have no lines pointing to them. These are your only valid targets.
2. Match the required colors for the active root Boxes by pulling from the exposed layers of the two Tunnels.
3. The left Tunnel holds Yellow and Pink. The right Tunnel holds Dark Blue, White, and Orange. Only pull exactly what the current active Arrow Box demands.
4. Start tapping the grey Hidden Boxes at the top of the pyramid one by one.
5. Never tap two Hidden Boxes in a row. Tap one, see what color it reveals, and check if you can use it immediately. If it does not match your active Arrow Box, leave it on the board.
6. Clear the prerequisite Boxes to unlock the tied ones behind them. The moment an Arrow Box loses its chain, prioritize filling it to keep the bottom tray moving.

Clearing the Final Hidden Pyramid in Marble Sort Level 668

By the time the Arrow Boxes are mostly cleared, your only remaining obstacle is the top pyramid.

1. The remaining bottom Boxes will now be standard, unlinked colors. Look at what you need to finish the columns.
2. Tap the remaining Hidden Boxes from the top down.
3. Keep an eye on your Conveyor Belt. Since you are dealing with mystery colors, you are at the highest risk of a late-game jam.
4. If a Hidden Box reveals a color you don't need, look for a matching cluster elsewhere on the board to force a quick clear before tapping any more question marks.