Marble Sort Level 300 — Walkthrough and Solution

Marble Sort Level 300 is a two-phase puzzle that starts with a locked right half and a cramped left side. The board is dominated by a vertical chain that splits the Top Tray, sealing off Yellow, Orange, Purple, and Light Green blocks until you find the golden key. Your immediate goal is to clear the left side's front row of bottom Boxes—Brown, Cyan, Pink, and Red—without pulling unnecessary colors onto your belt.

The left side is packed with numbered Panels, gray Mystery Boxes, and a mix of textured and solid blocks. The bottom edge holds Pink, Cyan, and Dark Blue; above them sit Red, Cyan, Brown, and White. The golden key is buried near the upper middle, guarded by Panels and Mystery Boxes. The second row of bottom Boxes demands Dark Blue, Yellow, Dark Blue, and White, but the right side's Yellow is locked away, so you must rely on left-side blocks until the chain breaks.

Marble Sort Level 300 Walkthrough

Your bottom Boxes dictate the order: front row needs Brown, Cyan, Pink, Red (left to right). Behind them, the second row wants Dark Blue, Yellow, Dark Blue, White. The right side is dead space until the key is collected, so ignore it completely.

The critical trap is the gray Mystery Boxes. They look like a quick way to clear space, but they dump unknown colors onto your belt. Since the right side is locked, a hidden Yellow or Orange can sit on your belt indefinitely, clogging your limited space. Avoid them until the board opens up.

How to Beat Marble Sort Level 300 — Step-by-Step

Phase one: Dig for the key

1. Tap the textured Pink block at the bottom left, feeding your waiting Pink Box.
2. Route the solid Cyan and Brown blocks just above that edge into their matching front Boxes.
3. Clear the exposed Red block to finish the front row.
4. Slide the textured Dark Blue block from the left edge into the second-row Box.
5. Carefully chip away at blocks surrounding the key, dropping matching colors to reduce numbered Panels.
6. Leave every Mystery Box alone unless it physically blocks the key block.

Phase two: Break the chain

1. Once the key clears, the right side unlocks—tap the Yellow blocks there to fill your waiting Box.
2. Clear the number 3 Panels on both sides by dropping blocks on them, ticking down the counters.
3. Watch your belt pressure: after the lock breaks, deep textured blocks (White, Orange, Green, Blue) appear in waves.
4. Now you can tap Mystery Boxes, but only when your belt has at least three empty slots to buffer random colors.

Phase three: Final flood

1. As the back layers reveal, your bottom Boxes shift to Light Green, Dark Green, and Purple demands.
2. Pull matching blocks from the right side, prioritizing textured blocks that sit on top of each other—the top block often reveals the exact next color.
3. Stop tapping if your belt has only two open slots; wait for a Box to clear and free up space before continuing.

Tips & tricks

• Always empty the front row of bottom Boxes before touching the second row—this keeps your belt unclogged.
• Count your belt slots before opening any Mystery Box; three free slots is the minimum safe buffer.
• When a numbered Panel appears, drop blocks on it as soon as possible to reduce the counter and reveal hidden layers.

Common mistakes

• Tapping Mystery Boxes early, which can dump unusable colors like Yellow or Orange onto your belt while the right side is locked.
• Ignoring the second row of bottom Boxes until the front is done, causing a backlog of Dark Blue and Yellow that blocks progress.
• Letting your belt fill to capacity while clearing midgame waves, forcing you to wait and lose momentum.

Marble Sort Level 300 FAQ

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