Marble Sort Level 638 is a locking puzzle where you must feed exact colors to numbered gears. The key is to avoid the large Red group on the left until the front row demands it, while using Blue to unlock the left tiles first.
The Top Tray holds a 9-marble Red block on the bottom left and a 9-marble Blue block on the bottom right. Above them, two flat sections trap Brown, Green, and Blue as unplayable tiles. The wall gears have a counter of 2, which drops each time you clear a bottom Box. The lower grid starts with a front row of Green, Blue, Green, Blue from left to right.
Marble Sort Level 638 Walkthrough
The bottom Boxes ask for Green, Blue, Green, Blue in that order. Only Blue is available at the start; Green is locked away. The Red pile is a trap because no Red Box is active initially.
The imbalance is that you must unlock the left flat tiles to get Green, which then lets you clear the front row and expose Red Boxes. If you tap Red early, it jams the belt.
How to Beat Marble Sort Level 638 — Step-by-Step
Phase one: Unlock the left wall
- Tap the 9 Blue marbles on the bottom right of the Top Tray.
- Allow six of them to fill the two Blue Boxes in columns two and four.
- Leave the remaining three Blue marbles on the belt.
- Refrain from touching the Red pile.
- Watch the left gear count down to zero; the left bordered section pops up into playable marbles.
Phase two: Release Green and then Red
- From the newly unlocked left-middle area, tap the Green marbles that appear.
- Route them down to fill the two Green Boxes in columns one and three.
- As the lower grid shifts, Red Boxes move into the front row.
- Now tap the 9 Red marbles on the left ledge; they clear into the Red Boxes.
Phase three: Handle Mystery Boxes and the rest
- After the Red clears, the right wall gear hits zero, opening the remaining flat tiles with Purple, Cyan, Orange, and Brown.
- Watch for gray Mystery Boxes approaching from the back rows.
- Only clear a regular Box blocking a Mystery Box if you have at least four empty belt slots.
- Pick off exposed Purple and Cyan from the top rows when their Boxes are active.
- Dig down the middle, prioritize center columns, and let Blue and Green filter into back-row Boxes to finish.
Tips & tricks
- Keep the belt clear before triggering any lock release.
- Always fill the front-row Boxes in order to progress.
- Use the Red pile only after Red Boxes are visible.
Common mistakes
- Tapping Red too early, which clogs the belt.
- Clearing a Box without checking the Mystery Box behind it.
- Ignoring the numbered gears, which slows progress.
Marble Sort Level 638 FAQ
Why does my Conveyor Belt flood on Marble Sort Level 638?
Because you tap the Red pile before Red Boxes are active, causing nine marbles to sit idle.
Which color do I clear first on Marble Sort Level 638?
Clear Blue first to unlock the left tiles and access Green.
How many moves does it take to clear Marble Sort Level 638?
Exact moves vary, but the sequence requires at least 18 taps for the starting blocks plus follow-ups.
Do I need boosters to beat Marble Sort Level 638?
No, but boosters can help if you make a mistake; careful play is sufficient.
What happens if I tap the Red pile early on Marble Sort Level 638?
The belt jams, leaving no room for Mystery Box demands, likely causing a fail.
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