Why do the two gate counters need to be watched together?

The left and right gates release different color waves; a route that looks safe for one side can consume the white slot needed by the other.

What remains after the blue background is mostly gone?

White body pixels, brown outline and gate fragments, plus the pink corner and short blue cards, still need to be routed before the clear.

Colony Flow! level guide

hard 7 colors

Lower the 401/501 dual gates with blue 32, yellow 19 and white 12 before peeling the blue-backed mascot and its pink, white and brown fragments.

If the player asks you to sign in, open the video on YouTube instead.

Tap blue 32, then yellow 19 and white 12, waiting for the first blue and yellow ants to return as the paired gates fall.
Tap pink 40 and dark 9 as a linked pair only after a white lane is free; let the gate release finish before taking another long card.
Route yellow 35 and brown 20, then use pink 17 and blue 23 as the counters move through the 300s and 200s.
Feed blue 40/35 and pink 45/45 one lane at a time, preserving the empty white slot for the next gate transition.
Use white 20/22 and the newly exposed brown 45 pieces after the right gate opens its lower white strip; leave the remaining blue field for the next return.
Clear dark 7/3, white 1/7 and blue 11/27/22 as the brown blocks shrink to small gate fragments.
Finish pink 2/5, brown 12 and the remaining blue 35/40 pieces around the mascot's body, waiting through the heavy white-ant return.
Remove the last pink corner, brown outline and blue background pixels, then wait for the final ants and the empty-board clear animation.

Colors in this level:

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

Starting pink 40/dark 9 before blue 32 and yellow 19 return fills the lanes needed by both brown gates.
Taking blue 40 and pink 45 together leaves no white buffer for the gate transition or the final brown fragments.

Open both gates with blue 32, yellow 19 and white 12 before taking pink 40/dark 9.
Keep one white slot empty through the long blue 40 and pink 45 routes.
Watch both gate counters and wait through the heavy white-ant return before the short endgame cards.

Board notes 5 details

Layout: A white cartoon mascot with a brown/red outline, pink and yellow cap or ear shapes and a large blue background. Brown gate blocks read 401 on the left and 501 on the right in the first stable frame; the video begins with a brief 500/600 display. The opening queue shows blue 32, two white empty slots, yellow 19 and white 12, followed by linked pink 40/dark 9, yellow 35, brown 20, pink 17, blue 23 and pink 45/white 45, with white 20 below.
Goal: Drain both brown gates, route blue, yellow, white, pink, dark and brown cubes to matching holes, peel the blue background and mascot body, and clear the last brown gate fragments and pink corner until the board is empty.
Opening: Tap blue 32, then yellow 19 and white 12, waiting for the first blue and yellow ants to return before tapping linked pink 40/dark 9. This keeps the two gate lanes releasing together.
Danger Zone: Pink 40/dark 9, yellow 35, brown 20 and blue 40/pink 45 compete for the five slots. Starting the linked pink/dark pair before blue 32 and yellow 19 return can block both gates; preserve one white slot through the low-hundreds transition.
Mechanics: A dual-gate, multi-stack routing board in which parallel brown counters expose a blue field, a white mascot, pink/yellow head shapes and late brown outline fragments in separate waves.

Why do the two gate counters need to be watched together?
The left and right gates release different color waves; a route that looks safe for one side can consume the white slot needed by the other.
What remains after the blue background is mostly gone?
White body pixels, brown outline and gate fragments, plus the pink corner and short blue cards, still need to be routed before the clear.