Marble Sort Level 373 Walkthrough Solution | Marble Sort 373

Marble Sort Level 373 Guide: The Massive Mystery Box Wall

Marble Sort Level 373 is going to test your patience right out of the gate. You load in and immediately see a massive, intimidating wall of grey Mystery Boxes dominating the Top Tray. The dominant starting colors are Yellow, White, and Purple, but the real star of this board is the unknown.

The top structure is shaped almost like a giant U, packed four rows deep in the corners with those grey question marks. They are blocking everything. The only lifeline the game gives you is a single front row of colored clusters sitting right at the bottom edge. This level is entirely controlled by how safely you can chip away at that front row without accidentally triggering a Mystery Box avalanche that ruins your run.

The unique Mystery Box trap in Marble Sort Level 373

To beat this board, you need to understand exactly how the trap is laid out. The Top Tray dangles a front row of colored clusters from left to right: Yellow, White, Purple, Green, and another Yellow. Behind every single one of these sits a hidden color.

Down below, the bottom setup is equally tricky. You have four active bottom Boxes waiting to be filled. The far-left column starts with an active Purple Box. The other three columns are entirely dominated by active Yellow Boxes.

Here is the problem. You see three Yellow bottom Boxes and two Yellow clusters in the Top Tray. It looks incredibly tempting to just blast the Yellows immediately. It is pure bait. If you focus too hard on the right side of the board and start cracking open the Mystery Boxes sitting behind those Yellows, you are going to lose.

Once those grey boxes open, they start spitting out Pink, Brown, Orange, and Dark Green marbles. None of those colors are active at the bottom yet! The Conveyor Belt has extremely limited space. The right side of the belt will get crowded first, and if you let it fill up with unplayable Brown and Orange marbles, your run is instantly dead. Every single tap in Marble Sort Level 373 has to be calculated to reveal specific bottom Boxes first.

Underneath that initial left-side Purple Box, there is a White Box waiting. Underneath those front Yellows, you will find Green and more Purple. You have to play front-to-back carefully, managing the reveal chain so the bottom opens up before the top floods you with useless colors.

Marble Sort Level 373 Step-by-Step Walkthrough

Follow this exact release order to keep the belt clean. Control your speed. Do not rush the grey boxes.

Beating the opening front row in Marble Sort Level 373

The first taps dictate the entire rhythm of the level. You need to clear the left side first to get access to the White Box.

1. Tap the Purple cluster sitting in the middle of the Top Tray. Send it straight to the far-left active Purple bottom Box.
2. Wait for that Purple Box to clear and drop away. A White bottom Box will now slide into the active position on the left.
3. Now tap the White cluster located second from the left in the Top Tray. This fills your newly revealed White bottom Box.
4. With the left side moving, tap the Yellow clusters on the far-left and far-right edges of the Top Tray. These will slot into the three waiting Yellow bottom Boxes.
5. Stop. Do not touch the Green cluster yet. You do not have an active Green bottom Box, and dropping it now will just burn valuable space on your Conveyor Belt.

Surviving the midgame Mystery Box reveal in Marble Sort Level 373

This is where Marble Sort Level 373 turns ugly. By clearing that front row, you have unblocked the lower edge of the grey Mystery Boxes. Some of them will now reveal their true colors.

You will suddenly see Dark Green, light Green, Pink, and Brown clusters appear in the Top Tray. Down below, clearing those initial Yellows will pull up new active Boxes, specifically Dark Green and Pink.

1. Immediately prioritize any newly revealed Dark Green marbles in the Top Tray. You should now have an active Dark Green bottom Box ready to take them. Slide them in to keep the belt clear.
2. Next, locate the Pink clusters that just unlocked on the right side of the Top Tray. Route them into the active Pink bottom Box that just surfaced on the far right.
3. Ignore the Brown and Orange marbles that might pop out of the center Mystery Boxes. Leave them sitting in the Top Tray. If you drop them onto the Conveyor Belt right now, they will get stuck.
4. Finally, release that original light Green cluster you left behind in the opening. The middle bottom columns should now have an active light Green Box ready to receive it.

Clearing the final columns in Marble Sort Level 373

Once you survive the midgame color swap, the board finally opens up. The remaining Mystery Boxes will reveal the rest of the Brown and Orange clusters you need.

1. Watch the bottom rows carefully. A White Box and a Brown Box will cycle up next.
2. Tap the Brown clusters located near the center-right of the Top Tray to clear that specific bottom Box.
3. Keep the Conveyor Belt moving by alternating between the final Orange and Pink clusters as their corresponding bottom Boxes slide into place.
4. Clean up any remaining outer edge Mystery Boxes one by one. Never tap two unknown boxes at the same time in this final phase.

Stick to this strict order, manage the unknown colors patiently, and you will easily clear Marble Sort Level 373 without jamming your belt.