What does the center number represent?

It is the visible gate counter, falling from 24 toward 1 as the surrounding receivers clear.

When should the small lower counters be handled?

After the larger 25/15/14/13/12 receivers have opened the lower chamber.

Sand Blocks level guide

expert 7 colors

Level 254 lowers a central 24 gate through a locked pink-and-cyan top chamber, then drains mirrored red reservoirs and a late green-orange wave.

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Drag top pink 8 receivers r2:c2-3 and r3:c2-3 into yellow lock footprint r2-3:c4-5; wait for each clear.
Move cyan L r4-5:c2-3 into left opening r3-4:c2-3; wait for 100%, then confirm gate 24 changes to 22.
Take lower pink 25 r3:c5-6, then 15 r4:c3 and 14 r4:c2; keep gate column c4 empty while settling.
Continue with pink 13 r5:c4 and 12 r5:c5, then small 4/2/1 receivers at r6-7:c3-5; wait for each decrement.
When feed opens at r1:c2-3, place orange vertical r2-3:c3 and green bars r3:c2/c6; wait for both to reach 100%.
Drain remaining blue/pink pieces from r4-7:c2-6, reduce gate through 8 and 1, and leave c4 empty during final settling.
Verify completion only after lower pink 1 clears and the level-complete animation appears.

Colors in this level:

Pink, Cyan, Red, Green, Orange, Blue, Yellow

Leaving cyan L across the central gate.
Entering the lower chamber before counter 25 has a clear side route.
Starting green/orange feed while top pink receivers still occupy the lock chamber.

Board notes 5 details

Layout: Top chamber has pink 8/6 receivers around a yellow lock footprint and cyan L. Central gate counts 24 downward; lower chamber contains pink counters 25, 15, 14, 13, 12, and 4 between red reservoirs.
Goal: Clear the lock chamber, preserve the gate column while the count falls, then empty lower counters before the green/orange feed switch.
Opening: Match top pink 8s, settle cyan L left of the lock, and reduce the center from 24 to 22 before opening lower lanes.
Danger Zone: Parking cyan L across the gate strands the lower 25/15 stack and blocks both red side feeds.
Mechanics: Yellow lock footprint, 24-to-1 gate counter, mirrored red reservoirs, staged pink waves, and late green/orange feed.

What does the center number represent?
It is the visible gate counter, falling from 24 toward 1 as the surrounding receivers clear.
When should the small lower counters be handled?
After the larger 25/15/14/13/12 receivers have opened the lower chamber.