Why is brown 5 the safest opener?

It is the exposed short brown lane that disappears in the next review frame and reveals the light-green 28 route without consuming the long reserve.

What should be left for the end?

The last yellow crown pixels, brown backdrop, dark purple 17 and green 6/short returns remain after the belly and cyan fins are open.

Colony Flow! level guide

hard 7 colors

Use brown 5 and light-green 28 to open the round yellow creature, then protect the short green, pink and cyan routes while the belly and fins clear.

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Tap brown 5 first, then wait for its return before opening light-green 28.
Use brown 15 and brown 16 as they surface, followed by the linked brown 7/1 short lane.
Start brown 50/56 and brown 50-green 5 separately; do not occupy all five holes in the early 100/32 phase.
Send yellow 25 and pink 4 once a green return is visible, then route cyan 25 to open the side fins.
Use brown 52 and dark purple 45 only after the first short green cards clear; pause at the 46-to-34 stage.
As the belly opens, alternate light-green 7, dark-green 5/2 and short cyan 4/1 cards instead of another long brown stack.
When the center is empty, clear the cyan fins and yellow face with yellow 25/45 and the returning pink 4.
At the late crown phase, route green 6, yellow 26 and dark purple 17, then take the linked brown/yellow 7 card.
Finish brown 50/52 and the last yellow arc only after side traffic returns; keep one slot open for the final short green card.
Wait for the last yellow and brown pixels to leave and the empty-board Colony Flow clear.

Colors in this level:

Brown, Yellow, Light green, Green, Cyan, Pink, Dark purple

Opening brown 50/52 and dark purple 45 together hides the short green, pink and cyan routes behind a full five-hole buffer.
Clearing the yellow face but ignoring the cyan fins leaves a large side target and prevents the final clear.

Board notes 5 details

Layout: A round yellow creature with cyan side fins and a green belly sits inside a brown field. The opening screen shows 100 markers at the top and right and a small 7 marker at left, followed by a 46 crown marker in the next phase. Visible holes include brown 5, light-green 28, brown 15/16, linked brown 50/56, brown 50-green 5, brown 52, pink 4, brown 50, dark purple 45, yellow 25 and cyan 25.
Goal: Clear the brown field, yellow head, green belly and cyan fins, then remove the last yellow crown arc and brown backdrop pixels until the board is empty.
Opening: Tap brown 5 first, then light-green 28. Use brown 15/16 and the linked brown 7/1 lane as returns free holes; delay brown 50/56, brown 50-green 5 and dark purple 45 until the short green route has passed.
Danger Zone: Long brown 50/52 and dark purple 45 cards can fill all five holes while green 5, pink 4 and cyan 25 are still queued, stalling the 100-to-46 release and the side fins.
Mechanics: The brown surround holds while different visible markers move through 100, 32, 46 and 34 stages. The green belly opens before the cyan fins finish, leaving a late yellow face, brown field and short green/dark tail route.

Why is brown 5 the safest opener?
It is the exposed short brown lane that disappears in the next review frame and reveals the light-green 28 route without consuming the long reserve.
What should be left for the end?
The last yellow crown pixels, brown backdrop, dark purple 17 and green 6/short returns remain after the belly and cyan fins are open.