Marble Sort Level 578 — Walkthrough and Solution

Marble Sort Level 578 is a color-sorting puzzle where two blue locks with a "2" on them each hold a yellow key that traps a separate wing of the upper board. You can't crack either lock until you clear a set number of bottom Boxes, and the early game is a tight squeeze for Conveyor Belt space. The trick is to ignore the tempting Brown and Light Blue marbles at the bottom of the Top Tray until you've used the Green and Orange to unlock the left side.

The board splits into three zones: a central column that drops freely, a left wing holding Brown and Purple, and a right wing with Dark Pink, Cyan, Orange, and Light Pink. The bottom Boxes start with Green, Orange, Orange, and Yellow in the front row, but the second row hides Light Blue, Brown, and more. The available marbles at the bottom of the Top Tray are Brown, Green, and Light Blue, while the Orange and Yellow you need are buried higher. That mismatch forces you to park the Brown and Light Blue on the belt to reach the Orange, but if you park too many, the belt jams.

Marble Sort Level 578 Walkthrough

Look at the bottom Boxes from left to right: Green, Orange, Orange, then Yellow. The second row behind them holds Light Blue and Brown. The left lock needs two Box clears to open; the right lock needs two more after that. The central column of the Top Tray has Green and Orange that you can access early, but Brown and Light Blue sit at the bottom edge, acting as blockers.

The one specific trap is that the Brown and Light Blue marbles are the first colors you can tap, but their matching Boxes aren't in the front row yet. If you drop them too early, they occupy your Conveyor Belt and prevent you from moving the Orange you actually need for the first clear. You must park exactly the two or three marbles that block the path to Orange, then immediately clear Orange to open the left lock before the belt fills.

How to Beat Marble Sort Level 578 — Step-by-Step

Phase one: Unlock the Left Wing

1. Tap the lowest Green marbles in the center of the Top Tray to drop them into the front-left Green Box. That clears the first Box and reduces the left lock from "2" to "1".
2. Now tap the Brown marbles and the Light Blue marbles that sit at the bottom of the tray, sending them to the Conveyor Belt. Leave them parked there—they block the path to Orange.
3. With the path clear, tap the Orange marbles that are now exposed in the center column, routing them into the front Orange Box. This clears the second Box, bringing the left lock to zero.
4. Watch the blue block slide away and the yellow key retract, releasing the left wing's Brown and Purple marbles into the active area.

Phase two: Flush the Belt and Clear the Middle

1. As soon as the left lock opens, the bottom Boxes shift forward, revealing Light Blue and Brown Boxes in the front row. Tap the parked Brown and Light Blue marbles off the Conveyor Belt into their matching Boxes, freeing up belt space.
2. Process the newly released Brown marbles from the left wing by dropping them into the active Brown Boxes.
3. Park the Purple marbles from the left wing onto the Conveyor Belt—there's no Purple Box visible yet, so stash them for later. Thanks to the flush, you have room.
4. Now focus on the right lock. Clear the Light Blue and Green Boxes that are now in the front row. Dig into the center grid of the Top Tray to find the matching Light Blue and Green marbles, and drop them into their Boxes. This reduces the right lock from "2" to "1", then to zero.

Phase three: Open the Right Wing and Finish

1. When the right lock hits zero, the second yellow key retracts, and the right wing drops Dark Pink, Cyan, Orange, and Light Pink marbles into the play area.
2. The back rows of bottom Boxes push forward, revealing Purple, Dark Pink, and Yellow Boxes.
3. Send your parked Purple marbles into the newly revealed Purple Box.
4. Clear the remaining colors by working front-to-back: match the Dark Pink marbles first, then the Cyan and Light Pink. Always choose the Box that is physically closest to the front to avoid creating new blockers.
5. Continue clearing all marbles until every Box is filled and the board is empty.

Tips & tricks

• Use your Conveyor Belt as a temporary holding area, but never fill it more than halfway—always leave room for the marbles you need to move.
• When you see a color that has no matching Box yet, park it on the belt, but keep a mental count of how many are there.
• After each lock opens, immediately clear the parked marbles that now have matching Boxes to free up space.

Common mistakes

• Dropping too many Brown and Light Blue marbles at the start, which jams the Conveyor Belt and prevents you from reaching Orange.
• Forgetting to clear the parked marbles as soon as their Boxes appear, leading to a full belt and no room for new drops.
• Ignoring the right lock and trying to clear colors from the right wing before it opens, which wastes moves and fills the belt.

Marble Sort Level 578 FAQ

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