Why must a hole stay free before revealing a mystery stack?

The revealed color can differ from every active route, so it needs an immediate matching hole to avoid a stall.

Which stacks should be delayed?

Hold white 47, dark 50 and later 40-count groups until the current revealed cards have returned holes.

Colony Flow! level guide

hard 8 colors

Clear the wild-haired scientist by opening magenta 7 and dark 31, then keep a hole free as eight mystery stacks reveal their colors in two rows.

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Tap magenta 7 and dark 31, then take peach 20 and white 47 only after their opening holes begin clearing.
Clear dark 26 and dark 50 as capacity returns; their four columns reveal white 40, red 8, cyan 47 and lime 21 in that order, so route each reveal before opening another long stack.
As cyan 47 and lime 21 drain, the second hidden row begins exposing cyan 40, dark 25 and peach 44; retain one recovery hole for every new color.
Clear the peach face and green flask with the short late stacks while the pink border moves, preserving the reveal-first rhythm.
Use late cyan 35/44, pink 50 and dark 40 only after the portrait splits into hair and outline fragments.
Finish the last cyan, magenta, peach and dark cards, then wait for the hair pixels to leave.

Colors in this level:

Cyan, Peach, Pink, Magenta, Dark purple, White, Black, Lime

Starting white 47 and dark 50 together removes the safety hole for the next mystery reveal.
Treating a question-mark card as optional leaves a hidden portrait color uncleared.

Open every mystery stack with one hole already free.
Delay white 47 and dark 50 until the current revealed color has a clear lane.
The last pieces are separated cyan hair and dark outline fragments near the top.

Board notes 5 details

Layout: A cyan-haired scientist fills a pink laboratory frame with a peach face, dark outlines, magenta mouth and green flask. Five holes face magenta 7 and dark 31 above peach 20, white 47, dark 26, dark 50 and two rows of four mystery-marked reserves.
Goal: Remove the pink frame and lab props, then clear the peach face, cyan hair, dark outline and magenta details until the final hair fragments disappear.
Opening: Tap magenta 7 and dark 31, then work peach 20, white 47, dark 26 and dark 50 only as holes return; those columns reveal white 40, red 8, cyan 47 and lime 21.
Danger Zone: Opening a mystery card with five occupied holes leaves no route for white 40, red 8, cyan 47 or lime 21; white 47 and dark 50 must therefore stay staggered.
Mechanics: A limited-buffer portrait uses eight concealed reserves in two rows; the first four flip to white 40, red 8, cyan 47 and lime 21.

Why must a hole stay free before revealing a mystery stack?
The revealed color can differ from every active route, so it needs an immediate matching hole to avoid a stall.
Which stacks should be delayed?
Hold white 47, dark 50 and later 40-count groups until the current revealed cards have returned holes.