Screenshots
Step-by-step solution
- Start with the front columns. They ask for Light Blue, Orange, and Yellow, so clear those three before the wall behind them.
- Clear the Light Blue front column first. It is the lowest front request and opens a lane to the belt.
- Move to Orange, then Yellow in the front. Keep the belt clear as you feed these three.
- Once the front is empty, the wall bottom becomes reachable. Feed the bottom wall marbles into the belt.
- Peel the wall from the bottom. Red, Green, and Purple sit at the base of the wall; clear them before the upper rows.
- Watch the belt count. The wall dumps a lot at once, so only feed when the belt shows one or two marbles.
- Drain the upper wall rows. With the base gone, the trapped Pink, Brown, and White marbles can finally slide down.
- Finish the last rows. Keep the belt under three stuck marbles and the closing colors sort themselves.
Why the Wall Will Not Budge
Level 400 is built around a solid wall of marbles that blocks the back of the board. The wall only moves when the columns in front of it are empty, so the front is your entire opening strategy.
The board opens with three front columns: Light Blue, Orange, and Yellow. Those are the only marbles you can act on at the start, because everything behind them is frozen by the wall.
The wall itself holds Red, Green, Purple at its base, then Pink, Brown, and White higher up. None of those move until the front columns are cleared.
Because the wall is solid, the belt underneath stays quiet early. That is your chance to feed the front without a jam behind you.
The trap is tapping a wall marble too early. It is locked, and a forced feed lands on a full belt and freezes the board.
Clear the Front Columns
Begin with the Light Blue front column. It is the lowest front request and clearing it opens a lane straight to the belt.
Light Blue is a base color here and appears again in the wall, so moving it early keeps that color flowing.
Next clear the Orange front column. Orange is mid-weight and only shows in the front, so remove it before the wall opens.
Finish the front with the Yellow column. Yellow also appears at the top of the wall later, so getting the front Yellow done now helps the finish.
Do not touch the wall yet. The front must be fully empty before any wall marble can move.
If a front marble is blocked by the column above it, clear the lower one first. The columns step the same way the wall does.
A clean front clear leaves three empty lanes. Those lanes are what the wall marbles will use to reach the belt.
The Wall Finally Moves
With the front columns gone, the bottom of the wall is now reachable at the front of the board.
Peel the Wall From the Bottom
Feed the bottom wall marbles first. Red, Green, and Purple sit at the base of the wall and are the natural first moves.
Red is a heavier color and only appears at the wall base, so clearing it early removes a color you cannot store elsewhere.
Green is a soft color that also appears once in the wall, so send it down as soon as it is free.
Purple is the last base wall color. With the front clear, it has a straight path to the belt.
Do not over-feed the wall. It dumps several marbles and the belt fills fast, so watch the count.
If the belt already holds two marbles, wait before feeding the wall. One more and it jams.
The base wall colors open the way to the upper rows behind them. Clear them in that order.
A steady bottom peel means the wall starts to lean forward and the upper marbles become free.
If a marble is blocked by the wall above it, clear the lower one first. The staircase rule holds here too.
Drain the Upper Wall Rows
Above the base sit Pink, Brown, and White, trapped by the solid wall below. Clear the base first, then peel these upward.
Pink is a quiet color here and only appears in the upper wall, so send it down as soon as it is free.
Brown is a calm color that appears once near the end. Clear it as it shows so it does not clog the belt.
White sits near the top of the wall. It only becomes reachable after Pink and Brown are gone, so be patient.
Watch the belt here. The upper wall releases a burst of marbles, so only feed when there is room.
As the upper rows drain, the top of the board opens. The closing Yellow and Light Blue marbles can finally slide down.
Keep the belt under three stuck marbles at all times. That single rule keeps the wall from refreezing.
A clean upper drain means the wall is gone and only the top rows remain.
Do not chase the top rows yet. The upper wall must be fully gone or the top marbles strand.
If a marble is blocked by the upper wall above it, clear the lower one first. The rule is the same on every row.
By the time the upper wall is empty, the board should be draining freely and the belt moving.
The upper wall is the second gate. Open it in order and the top rows take care of themselves.
Finish the Last Rows
The top rows hold the last Yellow and Light Blue marbles, plus any leftover wall colors. Feed them as they become free, bottom first.
The closing colors sort best with an empty belt. If three marbles stick, stop and let the front boxes pull one down.
Yellow and Light Blue are the last to leave. Send them one at a time so they do not collide on the belt.
When the wall, base, and upper rows are all drained, the final marbles drop straight into place.
Keep the belt under three stuck marbles at all times. That single rule wins this level.
When the last marble lands, the board clears. Level 400 is about order: front, then base, then upper, then top.
If you stall, look at the belt first. A jam there freezes everything, not the wall itself.
Frequently asked questions
What is the trick to beating Marble Sort Level 400?
First empty all three front columns (light blue, orange, yellow), then treat the base of the wall (red, green, violet) from bottom to top, and then the pink, brown, and white above. The belt jams if it holds 3 or more marbles, so always keep it at 1 or 2.
What happens if I touch the wall marbles too early on Marble Sort Level 400?
The wall does not move until the front columns are empty; touching it early locks the marbles and jams the belt. Wait until the front is completely empty before starting at the wall's base.
What should I do if the belt jams on Marble Sort Level 400?
Do not force marbles out of the wall. First place the matching color in a front box to reduce the belt by one marble, then continue. The golden rule is to peel the wall from bottom to top.
In what order should I handle the wall on Marble Sort Level 400?
Handle the wall from bottom to top: red, green, violet, then the upper layers: pink, brown, white. Any other order leaves marbles stuck and breaks the flow.
How do I finish the last columns on Marble Sort Level 400?
Route the remaining yellows and light blues at the top, plus the wall leftovers, starting from the bottom. Send them one by one when the belt has room; if a third marble falls, stop and let a front box bring it down.
Is Marble Sort Level 400 hard?
The difficulty is moderate. Once you understand that the wall will not move before the front is empty, just follow the order front, base, upper layers, top, without jamming the belt. Do not rush the wall; order is the key.