Which color should open Level 419?

Blue 5 and blue 16 are the safest opener because they return space before the white 25/25 and dark 25/30 routes become crowded.

Why wait before using dark 40?

It shares the lower route with the white cards; delaying it keeps a hole open for the hidden row and the late blue outline.

Colony Flow! level guide

hard 5 colors

Open the blue and white lanes first, then peel a purple night scene around a white snowman-like figure without trapping the dark 40 route.

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Send blue 5 and blue 16 through the opening holes, then start white 25 and the second white 25 as their routes return.
Route dark 25 and dark 30; leave dark 40 untouched while the hidden lower row is still locked.
Use white 25/30 to remove the lower white edge and open the first purple background section.
Clear the blue 13/18/11/37/17 group from shorter to longer cards as the night panel separates.
Reuse the returned holes for blue 41/50 and white 35/30 while the character body becomes isolated.
Hold one hole through the dark 30/35 transition so blue 3/4 and white 14/24 can surface.
Remove the remaining dark branch pieces with dark 20/25, then use blue 19/2 to expose the final face pixels.
Finish blue 11/14, white 2 and blue 20, then wait for the last purple and white ants to leave.

Colors in this level:

Blue, Dark purple, White, Orange, Black

Opening dark 40 while both white 25 routes are active blocks the blue return needed for the night panel.
Using the late blue 19/2 cards early leaves the final outline without a clean finishing lane.

Use blue 5/16 to open the board before feeding the long dark route.
Keep one white lane free while dark 25/30 and white 25/30 are both visible.
Save the late blue 19/2 cards for the final outline instead of burying them under dark 40.

Board notes 5 details

Layout: A white snowman-like character with an orange nose sits in a purple-blue night scene. Blue-violet stacks 5 and 16 lead into white 25/25, then dark 25/30, white 25/30 and dark 40; lower cards begin hidden behind question marks.
Goal: Strip the purple night panel, white character and dark branch pieces, then clear the final blue outline and small white/orange fragments.
Opening: Send blue 5 and blue 16 first, use the two white 25 stacks as their holes return, and delay dark 40 until the hidden lower row unlocks.
Danger Zone: The white stacks look interchangeable, but dark 40 crosses the same lower path. Starting it before the blue opener returns fills the holes and strands the purple outline.
Mechanics: A compact night-scene peel with quick blue refills, hidden lower cards and a late finish made from isolated blue, dark and white pixels.

Which color should open Level 419?
Blue 5 and blue 16 are the safest opener because they return space before the white 25/25 and dark 25/30 routes become crowded.
Why wait before using dark 40?
It shares the lower route with the white cards; delaying it keeps a hole open for the hidden row and the late blue outline.