Why does yellow 16 start Level 218?

It begins the upper yellow/orange detail and creates a draining yellow queue for yellow 17 without blocking cyan.

Why should a cyan bay stay open?

The long lower-right cyan extension is isolated by the green body; it needs an available bay before the body traffic becomes fresh again.

Colony Flow! level guide

hard 7 colors

Open yellow 16, then hold a yellow/cyan/green queue so the green creature body clears without isolating its cyan tail and red outer loop.

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

Colors in this level:

Green, Lime, Yellow, Orange, Cyan, Red, White

Keep a non-green bay available until the cyan lower-right extension has opened.
Use yellow 17 after yellow 16 shortens.
Save orange and red detail cards for the opened centre rather than starting them under fresh green traffic.

Board notes 5 details

Layout: A green creature-shaped mosaic with an orange round centre, red-and-white flower marks, a cyan lower-right tail/splash and a detached red loop. Opening cards: dark green 15, yellow 16, lime 20; orange 15, cyan 15, dark green 15; lime 15, yellow 17 and cyan 10.
Goal: Clear the green body, orange centre, flower marks, cyan extension and red right-side fragment until the picture is empty.
Opening: Start yellow 16, then feed cyan 15 and lime 20; use yellow 17 only after yellow 16 is draining.
Danger Zone: A burst of green 15/20 cards fills the five bays and strands the cyan tail; yellow 17 also needs a draining yellow 16 rather than a fresh queue.
Mechanics: Limited-buffer creature routing where repeated green body cards must leave a bay for the cyan tail and detached red loop.

Why does yellow 16 start Level 218?
It begins the upper yellow/orange detail and creates a draining yellow queue for yellow 17 without blocking cyan.
Why should a cyan bay stay open?
The long lower-right cyan extension is isolated by the green body; it needs an available bay before the body traffic becomes fresh again.