Marble Sort Level 307 Walkthrough & Solution

Level 307 Board Overview: Lock, Key, and Mystery Box Trap

The verified walkthrough identifies the opening board as Lock, Key, and Mystery Box Trap. The first confirmed moves are: Open by taking the orange stones found at the tray’s lower-middle and feeding them up into the orange Box that leads Column 1. Then: Take the dark green stones on the tray’s lower-right to empty the dark green Box that leads Column 2 and flip the first question box. The next safe order is recorded below so the belt does not fill with bait.

The Trap in Marble Sort Level 307

• Opening bait: Slide the two pink/red piles from the bottom line into the pink/red Boxes that head Column 3 and Column 4, then wait until you see what the grey boxes in Column 2 and Column 4 ask for.
• Board order: Force the left side downward, taking the light pink stones over there to empty the next Box heading Column 1.
• Belt discipline: Use only the first verified clears here; do not spend belt space on a color without an active receiver.

Marble Sort Level 307 Step-by-Step Walkthrough

Opening: follow the safe first clears

1. Open by taking the orange stones found at the tray’s lower-middle and feeding them up into the orange Box that leads Column 1.
2. Take the dark green stones on the tray’s lower-right to empty the dark green Box that leads Column 2 and flip the first question box.
3. Slide the two pink/red piles from the bottom line into the pink/red Boxes that head Column 3 and Column 4, then wait until you see what the grey boxes in Column 2 and Column 4 ask for.

Midgame: open the next receiver path

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

4. Force the left side downward, taking the light pink stones over there to empty the next Box heading Column 1.
5. If those fresh question boxes want light blue or deep blue, remove the stones parked against the golden key marker and send them only when a matching receiver shows up.
6. Once the lane is open, strike the block that carries the golden key so the top-center chain snaps and the light green, deep blue, and yellow row breaks free.

Cleanup: finish the remaining sequence

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

7. Review your arrow dependencies now, moving the light green and yellow stones only after the receivers they point to have fallen, then edge inward from the cleared left using the frozen orange and light blue stones once two neighbors are dropped.
8. Turn to the tray’s upper-right zone to satisfy any brown or purple the question boxes need, avoid parking more than two unmatched stones, and empty the final pink and blue stacks in sequence to close the board.

Level 307 Tips Recap

• Slide the two pink/red piles from the bottom line into the pink/red Boxes that head Column 3 and Column 4, then wait until you see what the grey boxes in Column 2 and Column 4 ask for.
• Once the lane is open, strike the block that carries the golden key so the top-center chain snaps and the light green, deep blue, and yellow row breaks free.
• Turn to the tray’s upper-right zone to satisfy any brown or purple the question boxes need, avoid parking more than two unmatched stones, and empty the final pink and blue stacks in sequence to close the board.