What happens when a crate counter reaches zero?

Its blocked section opens and exposes another stack, so one hole must already be available for that release.

Why begin with the three brown and orange stacks?

They attack the dock and left 100 counter immediately without consuming space needed by the first blue route.

Colony Flow! level guide

hard 7 colors

Open the dock musician with brown 16, brown 26 and orange 35, then reserve a hole whenever the 100 and 50 crate gates release new stacks.

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Tap brown 16, brown 26 and orange 35; let the first dock wave reduce the 100 counter.
Add blue 45 only after a brown hole returns, then alternate red 20/25/35 with dark 8/25.
Feed brown 30/40 and blue 30/40 into reopened holes while both crate counters fall.
Take each gate's newly released short brown or blue card before committing either white 50 stack.
Clear the remaining pink sail and brown musician groups while keeping one hole free.
Route the final blue, brown, red and dark remnants, then wait for the empty dock frame.

Colors in this level:

Brown, Orange, Blue, Pink, Red, White, Dark purple

Filling all five holes just before a crate reaches zero leaves its released stack stranded.
Sending both white 50 stacks early ties up the tray while shorter gate-clearing cards wait.

Reserve one hole before either crate counter reaches zero.
Use released short cards before committing a waiting white 50 stack.
Alternate blue sky with brown dock routes so neither color monopolizes the tray.

Board notes 5 details

Layout: A brown string musician stands on a wooden dock between pink sails under blue sky. A left crate counter reads 100 and a right gate reads 50; five holes face brown 16/26 and orange 35 above blue 45, white 50, dark 25, red 35 and more dock colors.
Goal: Reduce both crate counters to zero, then clear the blue sky, wooden dock, pink sails and the musician's brown body and instrument.
Opening: Tap brown 16, brown 26 and orange 35, then wait for a brown stream to return before adding blue.
Danger Zone: Each side-gate clear releases another card while four routes may still be active; taking white 50 or another 45 stack too early removes the needed landing hole.
Mechanics: A double-counter board alternates 100- and 50-cube gate progress with blue-sky and brown-dock perimeter traffic.

What happens when a crate counter reaches zero?
Its blocked section opens and exposes another stack, so one hole must already be available for that release.
Why begin with the three brown and orange stacks?
They attack the dock and left 100 counter immediately without consuming space needed by the first blue route.