Marble Sort Level 172 Walkthrough Solution | Marble Sort 172

Marble Sort Level 172 Guide: The Red Bait and The Locked Right Column

Marble Sort Level 172 is a massive bait-and-switch. When you first drop into the level, the board looks manageable. You have a colorful mix of Pink, Red, Brown, and Green staring you down. But this level is designed to trap you in the very first five seconds. The dominant colors clogging your view are entirely out of sync with what the bottom Boxes actually want.

This board demands strict space management. You are dealing with heavily blocked columns, a cluster of Mystery Boxes in the center, and a nasty Lock and Key setup on the right side. The front row of the Top Tray is filled with colors you do not immediately need. If you blindly tap everything in the front row just to clear space, your Conveyor Belt will jam before you even reach the midgame.

You have to play this backward. We need to selectively pull specific marbles to open up the exact route required for the first major clear.

The Brutal Board Layout in Marble Sort Level 172

Let’s break down exactly what you are looking at right now. The identity of this board is defined by a terrible mismatch between the top and the bottom.

Look down at your starting front row of bottom Boxes. You need Brown, Green, Brown, and Pink.

Now look up at the Top Tray. The front row ready to drop is Pink, dark Red, dark Red, Pink, and Green. Do you see the problem? There is no Brown in the front. The Brown marbles you desperately need to clear those two front Boxes are trapped in the second row, sitting directly behind the dark Reds.

The dark Red marbles are absolute bait. There is no Red bottom Box anywhere in the active front rows. If you drop both sets of Red marbles onto the Conveyor Belt right away, they will sit there, burning precious slots while you try to dig out the Browns.

The board is flanked by two major obstacles. On the far left, you have blue barrier blocks marked with a "2". These act as countdown blockers. They trap the left column entirely, meaning the Black and Pink marbles over there are untouchable until you clear at least two bottom Boxes.

On the far right, you have your primary midgame goal: the Lock and Key. The key sits on the third row down in the right column, resting on a grey block. You must dig through the Green and Yellow marbles above it to grab that key. Why? Because if you look at the bottom Boxes, the far-right stack hides a purple Box sealed with a heavy lock. Until you grab that key, the entire right side of your lower board is heavily restricted.

Finally, the center of the board is an unpredictable mess. Below the top layers of Brown and Orange, you have a massive grid of grey Mystery Boxes marked with question marks. You cannot plan for these colors yet. You just have to survive the front-row trap so you have enough Conveyor Belt space to handle whatever the Mystery Boxes throw at you.

Marble Sort Level 172 Step-by-Step Walkthrough

This solution requires extreme patience. Do not touch a single marble until you know exactly where it is going. We are going to carefully extract the necessary colors while leaving the bait exactly where it is.

Beating the Front Row Bait in Marble Sort Level 172

The first phase is entirely about getting those hidden Browns without destroying your belt space.

1. Tap the far-right Green marbles. Send them straight down. They will immediately drop into the front Green bottom Box and start filling it.
2. Tap the two Pink marble sets in the front row. Send them to the Conveyor Belt. Because there is a Pink bottom Box ready on the far right, they will start processing and clearing out.
3. Carefully drop only ONE set of Red marbles. You have to move at least one Red set to access the Brown marbles behind them. Send it to the Conveyor Belt and accept that it will sit there taking up space. Do not touch the second set of Reds if you can avoid it.
4. Extract the Brown marbles. Now that the path is open, drop the Brown marbles from the second row into the two front Brown bottom Boxes.
5. Clear the first wave. Once the Browns hit home, those two bottom Boxes will clear out. This triggers the blue countdown blockers on the left side to drop their numbers, bringing you closer to opening the left column.

Exposing the Mystery Boxes in Marble Sort Level 172

Clearing the Brown and Green Boxes drastically changes the level. The lower board shifts, pulling forward a fresh row of Blue, Blue, Pink, and Green bottom Boxes.

6. Clear the remaining bait. If you have Red or Orange bottom Boxes sliding into the active slots, immediately drop the Red and Orange marbles from the Top Tray to flush your Conveyor Belt. You need that belt empty for the next phase.
7. Reveal the center. With the front lines cleared, start tapping the grey Mystery Boxes in the middle. Do this slowly. Tap one, see its color, and match it to an active bottom Box. If you blindly tap all the Mystery Boxes at once, you will flood the belt with unmatched colors.
8. Target the right column. You must now prioritize the right side of the Top Tray. Drop the Yellow marbles to expose the Key.
9. Grab the Key. Once the path is clear, tap the block holding the Key. This immediately unlocks the purple bottom Box on the lower right, opening up your escape route for the late game.

Unlocking the Final Sequence in Marble Sort Level 172

Now that the board is wide open, the pressure shifts. The left column is finally unlocked, and the Lock and Key sequence is finished.

10. Clear the left column. Drop the Black and remaining Pink marbles from the newly opened left side. Match them into the active bottom Boxes.
11. Flush the final Mystery Boxes. You will likely have a few remaining hidden blocks in the center. At this point, your Conveyor Belt should be relatively clear. Tap them one by one, dropping the final Blues, Greens, and Oranges to their matching lower Boxes.
12. Fill the locked Box. Now that the purple bottom Box is unlocked, send the remaining purple marbles straight into it to finalize the board. Keep your taps deliberate at the very end so a stray mismatch doesn't ruin your perfectly organized belt.