Why should only three dark 70 stacks overlap?

The remaining holes are needed for red, cyan, white, yellow and green cards released while the two counters fall.

Which counter lasts longer?

The 1000 platform gate controls the longer phase and must clear before the lower suit and base can finish.

Colony Flow! level guide

hard 9 colors

Break the astronaut's 500 upper gate and 1000 platform gate by alternating repeated dark 70 routes with red, white, cyan, yellow and green support.

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Start red 70, dark 60, white 65, orange 30 and the second dark route, then wait for a hole to return.
Alternate dark 70 with yellow 29, green 15, blue 65 and cyan 62/65 while both counters descend.
Reserve one hole whenever either counter approaches zero so its newly exposed support card can enter.
After the platform gate opens, clear the brown base and lower suit with white, cyan, red and dark waves.
Work upward through the colored beams, pale-cyan suit and visor without running more than three dark 70 routes together.
Finish the star panels and last visor pixels with late dark, white and yellow cards, then wait for Victory.

Colors in this level:

Dark purple, Pale cyan, Cyan, Red, Yellow, Green, White, Orange, Brown

Opening five long dark stacks removes every landing hole for gate releases and short suit colors.
Assuming the 500 upper gate is the finish ignores the larger 1000 platform counter.

Limit simultaneous dark 70 routes to three.
Use returned holes for yellow 29, green 15 and cyan support before opening another 70.
Reserve a hole whenever either counter approaches zero.

Board notes 5 details

Layout: A pale-cyan astronaut floats between dark star panels, colored light bands and a brown platform. Upper and lower counters begin at 500 and 1000; five holes open with red 70, dark 60, white 65, orange 30 and dark above many dark 70, blue/cyan 62-65, yellow 29 and green 15.
Goal: Reduce both gates, then clear the platform, starfield, colored beams, pale-cyan suit and dark visor.
Opening: Tap red 70, dark 60, white 65, orange 30 and the second dark route, then wait for one long stream to return before taking another card.
Danger Zone: Running dark 70 across every hole blocks short counter-release colors during this six-minute board; at most three dark 70 routes should overlap.
Mechanics: A double-counter endurance level combines 500- and 1000-cube gates with repeated maximum-size starfield stacks.

Why should only three dark 70 stacks overlap?
The remaining holes are needed for red, cyan, white, yellow and green cards released while the two counters fall.
Which counter lasts longer?
The 1000 platform gate controls the longer phase and must clear before the lower suit and base can finish.