Why do purple accents need their own buffer?

Purple 2 and 6 are tiny stacks that appear between long red waves. Without a free hole they have nowhere to route and block the final cleanup.

When should white 18 be used?

Route white 18 in the early mid-phase, before the third red 20, so the shirt clears before the suit's dark stacks dominate the tray.

Colony Flow! level guide

medium 6 colors

Clear the red-background suited figure by opening red 20/20 and peach 15, then reserving a hole for the tiny purple tie and shoe stacks.

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

Tap both red 20 stacks and peach 15, then wait for the first red stream to return.
Add brown 10 and dark 20 as holes return from the opening wave.
Route white 18 and purple 2/6 before launching another red 20.
Alternate red 12/16/20 with dark 20/22 and peach 11/15 through the mid-phase.
Clear late red 1/4/5/9 and white 8/12 fragments between dark routes.
Route the remaining dark hair and suit pixels one stream at a time.
Finish the purple tie and shoe pieces, then wait for Victory.

Colors in this level:

Red, Dark purple, Peach, White, Brown, Purple

Crowding out the small purple tie and shoe cards by filling all holes with red and dark stacks.
Delaying brown 10 until late phase, where it competes for the same buffer as purple fragments.

Keep the fifth hole reserved for purple; its small stacks appear between long red waves.
Split red waves with white or peach to avoid full-tray lockouts.
Route brown 10 early so it does not compete with late purple fragments.

Board notes 5 details

Layout: A peach-faced figure in a dark suit with white shirt, purple tie and shoes, and dark hair stands on a red field. Five holes serve red 12/16/20, brown 10, peach 11/15, dark 20/22/26, white 8/12/18, and purple 2/6.
Goal: Clear the red field, then remove the dark suit, peach face, white shirt, purple tie and shoes, and dark hair until the board is blank.
Opening: Tap red 20, red 20, and peach 15; wait before adding dark 20 and brown 10 so the opening red routes can return a hole.
Danger Zone: Repeated red 20 and dark 20 routes can block the one-digit purple tie and shoe pieces. Purple 2/6 must land in an empty buffer or they strand the final details.
Mechanics: A large red background surrounds a narrow dark outfit with tiny purple accents that require reserved buffer space during the long field-clearing phase.

Why do purple accents need their own buffer?
Purple 2 and 6 are tiny stacks that appear between long red waves. Without a free hole they have nowhere to route and block the final cleanup.
When should white 18 be used?
Route white 18 in the early mid-phase, before the third red 20, so the shirt clears before the suit's dark stacks dominate the tray.