Marble Sort Level 309 Walkthrough & Solution

Level 309 Board Overview: Arrow Box & Lock Trap

The verified walkthrough identifies the opening board as Arrow Box & Lock Trap. The first confirmed moves are: Open by ignoring the clickable-looking Purple, Red, and Pink in the far-left column, and instead find the Dark Blue marbles at the bottom of both outer columns to clear the inner-right Dark Blue Box. Then: Clearing the Dark Blue pulls up a Green Box, then tap the cluster of White marbles just above the old Dark Blue spot in the outer right column to clear the right-side White Box. The next safe order is recorded below so the belt does not fill with bait.

The Trap in Marble Sort Level 309

• Opening bait: Emptying that white target summons a cyan receiver, which hands you live green and cyan goals that crack the center open.
• Board order: Push the textured cyan and green stones from the tray’s lower-center-left into the fresh cyan and green receivers below.
• Belt discipline: Use only the first verified clears here; do not spend belt space on a color without an active receiver.

Marble Sort Level 309 Step-by-Step Walkthrough

Opening: follow the safe first clears

1. Open by ignoring the clickable-looking Purple, Red, and Pink in the far-left column, and instead find the Dark Blue marbles at the bottom of both outer columns to clear the inner-right Dark Blue Box.
2. Clearing the Dark Blue pulls up a Green Box, then tap the cluster of White marbles just above the old Dark Blue spot in the outer right column to clear the right-side White Box.
3. Emptying that white target summons a cyan receiver, which hands you live green and cyan goals that crack the center open.

Midgame: open the next receiver path

After the opening clears, let the next exposed groups move only when their receiver is ready.

4. Push the textured cyan and green stones from the tray’s lower-center-left into the fresh cyan and green receivers below.
5. Those moves clear the block and rouse the orange, yellow, and white arrows, so use the awake yellow arrow to empty the far-left starting yellow receiver and flip the question box over it.
6. Rotate the lower goals until brown and yellow receivers surface, then push the textured brown and yellow stones from the tray’s lower-right to rouse the pink and green arrows.

Cleanup: finish the remaining sequence

The final phase follows the remaining source order. Pause whenever the belt starts to fill.

7. With the textured blocks gone and the arrows cleared, the Lock and Key obstacles start coming undone, flooding deep Red, Pink, and Brown into the playable area.
8. Release marbles from the newly unlocked center only when an exact matching Box is ready, and if you bottleneck, use the ignored Purple and Red on the outer left as escape valves to cycle the board and win.

Level 309 Tips Recap

• Emptying that white target summons a cyan receiver, which hands you live green and cyan goals that crack the center open.
• Rotate the lower goals until brown and yellow receivers surface, then push the textured brown and yellow stones from the tray’s lower-right to rouse the pink and green arrows.
• Release marbles from the newly unlocked center only when an exact matching Box is ready, and if you bottleneck, use the ignored Purple and Red on the outer left as escape valves to cycle the board and win.