Why are there two counters on this board?

The left and right brown panels drain independently, so a nearly clear left panel does not mean the right counter has released its purple route.

What remains after both panels open?

The yellow cap, white face, pink mouth, ornaments and a small yellow-centered purple cluster still need their short returning cards.

Colony Flow! level guide

hard 7 colors

Drain the two brown counters with the purple 27/30/34 opener, then pace the white, yellow and pink details around the yellow-capped character.

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On the active Level 429 board, launch purple 27, purple 30 and purple 34 in order.
Let one purple stream return, then add purple 24, 27, 31 and 35 as the top row cycles.
Wait for the left counter to move below its opening value before taking white 24 or orange-yellow 25.
Use white 24, orange-yellow 25 and pink 15 one at a time, preserving a hole for dark-purple 6.
Continue the purple 34/35 wave while the left gate falls through the 390s and the right gate stays near 600.
Clear the brown left panel and yellow ornaments with returning white and yellow cards before another 35-count purple stack.
When the right counter begins to fall, route purple 20/24/28/32/33 and leave one hole for the pink detail.
Strip the yellow cap, white face and pink mouth, then clear the detached purple field and brown right panel pieces.
Route the last purple, yellow and white fragments, including the short 1/11/15 cards visible near the end.
Wait for the yellow-centered purple fragment to leave and confirm the Colony Flow celebration.

Colors in this level:

Purple, Dark purple, Yellow, White, Pink, Orange, Brown

Starting white 24 and orange-yellow 25 before the purple opening returns can starve the dark-purple 6 face route.
Watching only the left gate makes the still-high right counter look finished and causes the final purple panel to stall.

Watch both brown counters; the left panel can open while the right remains high.
Use purple 27/30/34 first, then reserve a hole for white 24 and pink 15.
Save the short 1/11/15 cards for the final yellow-centered purple fragment.

Board notes 5 details

Layout: A yellow-capped, white-faced character with a pink mouth and yellow ornaments sits on a purple tiled background. Brown gate panels cover the left and right sides; the first active frame reads about 394 and 600, while a later review frame reads 364 and 570. The opening purple row is 27, 30 and 34, followed by purple 24, 27, 31 and 35; reserve cards include white 24, orange-yellow 25, pink 15, purple 34/35 and dark-purple 6.
Goal: Drain both brown gate panels, clear the purple field, then remove the yellow cap, white face, pink mouth, ornaments and final purple fragment.
Opening: On the active board, tap purple 27, purple 30 and purple 34. As those streams return, add purple 24, 27, 31 and 35; wait for the left counter to move before opening white 24, orange-yellow 25 or pink 15.
Danger Zone: The two counters share five holes. Filling the buffer with the purple 27/30/34 wave plus white 24 and orange-yellow 25 hides pink 15 and dark-purple 6, while the right counter can still be near 600.
Mechanics: The source has a home/loading sequence before the board. Two independent brown counters drain at different rates, then the character breaks into purple, yellow, white and pink pieces; a yellow-centered purple cluster remains late.

Why are there two counters on this board?
The left and right brown panels drain independently, so a nearly clear left panel does not mean the right counter has released its purple route.
What remains after both panels open?
The yellow cap, white face, pink mouth, ornaments and a small yellow-centered purple cluster still need their short returning cards.