Marble Sort Level 387 Walkthrough & Solution

Level 387 Board Overview: Two Sealed Corners and a Loaded Belt

Level 387 opens as a Hard board, and both sides of the tray are sealed before you make a single tap. On the left, a wooden crate stamped with an X sits on top of the far-left column, hiding the run of Green, White, Dark Red, and Light Blue stacked underneath it. On the right, a gate chained shut with a padlock cages the far-right columns — Purple over Pink — and a Yellow Key tile sits just beside the gate, waiting to be dropped into it.

The middle of the tray is crowned with grey numbered “3” covers and a scatter of grey ”?” Mystery Boxes, so you cannot see the full board from the opening frame. Behind the covers sit solid Dark Red, White, Yellow, and Green squares that are genuinely useful — the trick is earning them in the right order while half the tray stays blind.

The conveyor below is the one honest part of the opening. It is already loaded: Pinks spill through the left funnel in a long run, a lone Orange block sits parked at the center of the belt, and Blue and Green batches ride the right side. The belt gives you your first free clears — and it also tells you which colors the receivers are about to want.

The Trap in Marble Sort Level 387

The board is rigged to make you dig into sealed corners before the receivers are ready. Here is the layout:

• The padlock gate cages the Pinks and Purples: the far-right stacks sit behind a chained gate, and the Yellow Key beside it is the only thing that breaks the chain. Until the key is dropped, that whole corner is off-limits.
• The X-crate seals the left column: the crate caps a useful Green, White, Dark Red, and Light Blue stack, but clearing around it exposes colors early — check the receiver row before every tap.
• “3” covers and ”?” Mystery Boxes hide the tray: numbered covers tick down as their stacks feed, and the Mystery Boxes reveal their colors only when you interact with them. You cannot plan a combo on a color you cannot see.
• The belt starts loaded: Pinks, Blues, and Greens are already in transit, and the Orange block sits dead center with no obvious home at the start. Feed a color whose receiver is not live and the queue jams before the first Box clears.

Marble Sort Level 387 Step-by-Step Walkthrough

Let the pre-loaded belt drain before you touch the sealed corners. Follow the release order.

Opening: clear the loaded belt and strip the covers

1. Let the Pinks spilling through the left funnel land first — they were loaded onto the belt before you started, so they clear into whichever Pink receiver is live.
2. Feed the Blue and Green batches riding the right side of the belt as their receivers open. These are free clears; take them one batch at a time.
3. Leave the Orange block parked at the center of the belt alone. Its receiver is not at the front of the row in the opening, and forcing it just clogs the queue.
4. Peel the grey numbered “3” covers off the visible columns as their colors match a live receiver. Each cover ticks down as the stack underneath feeds, so treat a covered stack as a countdown, not a fixed color.
5. Start revealing the grey ”?” Mystery Boxes scattered across the tray. If the reveal matches a receiver that is showing, drop it; if not, leave the column and come back later.
6. Do not tap into the X-crate column on the left or anything behind the padlock gate on the right. Both corners stay sealed through the opening.

Midgame: break the crate, fire the key

The opening clears cycle the receiver row forward, and the tray finally starts to show its real colors. The active receivers now ask for Orange, Blue, and Light Blue, and the tray beneath the covers holds the Dark Red, White, Yellow, and Green squares you saw peeking out at the start.

7. Clear the visible Green, White, and Dark Red squares across the upper tray — they sit directly in front of the crate and the gate and are the level’s honest midgame drops.
8. Dig the column under the X-crate on the left one tile at a time. The Light Blue tiles underneath feed cleanly whenever a Light Blue receiver is showing.
9. Keep the receiver row cycling. Every Box you fill slides the next request forward, and the belt starts carrying the colors you freed — match each batch as it arrives.
10. Drop the Orange block from the center of the belt now that its receiver has cycled to the front. That parked Orange finally has a home, and clearing it empties the middle of the queue.
11. Reach the Yellow Key tile on the right side of the tray and fire it into the padlock gate. The moment the key lands, the chain shatters and the caged Purples and Pinks spill free.

Cleanup: the freed corner and the stragglers

With the gate open, the level becomes a finishing line. The freed right-side stacks pour Purple over Pink into the receivers, and the last frame of the run still shows an active board — the final colors are still cycling through the belt, so keep playing to the front row.

12. Feed the freed Purples first, then the Pinks — they drop in runs from the opened corner, so a full matching batch finishes a Box in one pass.
13. Work the remaining columns one tile at a time. Leave any single whose receiver has not cycled to the front; the belt can hold it for a lap without stalling.
14. Take the last Blues, Greens, and the closing Yellow and Red singles as their Boxes slide forward.
15. Let the final stragglers drop and empty the tray. The level completes the moment the last marble lands.

Level 387 Tips Recap

• The belt starts loaded for a reason — let the Pinks, Blues, and Greens drain before adding new drops, and never force the parked Orange early.
• Treat both sealed corners as off-limits in the opening: the X-crate column and the padlock gate open only in the midgame.
• The Yellow Key is the pivot of the run. When it drops, the gate dumps several marbles at once, so keep belt room clear before firing it.
• Only feed colors with a live receiver — “3” covers and ”?” Mystery Boxes mean the tray is half-blind, so verify every tap.