Why should white 39 be played early?

It opens the muzzle and paw route while the cyan perimeter is still draining, reducing pressure in the middle wave.

What is the best buffer rule?

Keep one hole available whenever a 100 counter or the hidden card is about to release a new color.

Colony Flow! level guide

hard 6 colors

Open the red panda with paced cyan stacks, route white 39 early, and protect space for three embedded 100 counters and a hidden card.

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Launch cyan 30, cyan 50 and cyan 35; keep two holes available during the first perimeter drain.
Add white 39 through the first returned hole, then use cyan 20/36 for the lower ledge.
Route dark 25 alone as the first facial outline opens; do not pair it with another cyan 50.
Alternate red 35/45 with pink 32/35 to clear the ears, forehead and tongue around the 100 counters.
Use peach 25/32 and white 25/40 for the inner ears, muzzle and paws as the left counter falls.
Clear the hidden card through an empty hole, then match its short route before returning to cyan 35/40.
Route dark 35/50 and red 38/45 as the eye masks and cheek outline separate.
Finish white 30/40, pink 32 and the last cyan ledge and border fragments, then wait for the blank board.

Colors in this level:

Cyan, Red, White, Peach, Pink, Dark purple

Saving white 39 for the end delays the muzzle and crowds the middle red-and-dark wave.
Opening every cyan stack before a counter release leaves no space for the hidden or short facial card.

Board notes 5 details

Layout: A red panda peers over a cyan ledge with peach ears, a white muzzle and paws, a pink tongue and dark stripes. Three counters begin at 100: one by the left ear and two overlapping above the forehead. Five holes face white 39 and cyan 30/50/35; deeper cards include pink 32/35, red 35/45, dark 25/35 and a hidden card.
Goal: Strip the cyan field and ledge, clear all three 100 counters, then remove the red fur, peach ears, white face and paws, pink tongue and dark outline.
Opening: Start cyan 30, cyan 50 and cyan 35, then route white 39 through the first returned hole instead of opening another cyan stack.
Danger Zone: Long cyan routes stay active while the counters expose short red, pink and dark facial cards. Filling every hole delays the exact detail needed next.
Mechanics: Three counters embedded in the portrait split the route into cyan perimeter, red-and-dark face and white-and-pink finishing waves.

Why should white 39 be played early?
It opens the muzzle and paw route while the cyan perimeter is still draining, reducing pressure in the middle wave.
What is the best buffer rule?
Keep one hole available whenever a 100 counter or the hidden card is about to release a new color.