Why are all three magenta 18 stacks safe at the start of Level 220?

They are the recorded short opener wave and begin clearing the pink rails; the larger magenta 20 cards are held for the later handoff.

When should cyan be routed?

After a yellow or purple route has begun to drain, so the thin cyan X crossings have a free bay instead of waiting behind a solid pink queue.

Colony Flow! level guide

hard 7 colors

Use the three front magenta 18 starters to open the diamond quilt, then stage yellow, purple and cyan traffic before the later magenta 20 wave.

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Tap the three front magenta 18 stacks in order, letting the first begin to drain before the third.
Add yellow 16/18 after the early magenta counts are short.
Feed purple 20 with yellow, using a returned bay for a grey question-mark stack.
Alternate magenta 20 with yellow/orange and cyan crossing cards.
Finish lower orange diamonds, cyan X strokes and the short magenta/purple tails.

Colors in this level:

Magenta, Pink, Purple, Yellow, Orange, Cyan, Gray

Do not start magenta 20 cards alongside the fresh three-card magenta 18 opening.
Do not turn all five bays pink before the cyan crossing cards have a route.

The three magenta 18 stacks are safe openers; the magenta 20s are a later wave.
Reserve a returned bay for cyan whenever yellow starts opening the diamond cores.
Use question-mark stacks only through a draining bay.

Board notes 5 details

Layout: A full orange-yellow, pink/magenta, cyan and purple diamond quilt. The opening row is three magenta 18 stacks; later cards include magenta 20, grey question-mark stacks, yellow 16/18 and purple 20, with five white bays.
Goal: Clear the pink rails, purple bands, yellow/orange diamond cores and cyan X crossings until the quilt is empty.
Opening: Tap the three front magenta 18 stacks in order, then add yellow only after the first pink wave is visibly draining.
Danger Zone: The later magenta 20 cards fill every bay if started beside the fresh 18 trio, leaving no route for yellow diamond cores or cyan crossings.
Mechanics: Repeated-pattern routing with a short magenta 18 opener phase followed by serial magenta 20 handoffs around yellow and cyan detail cards.

Why are all three magenta 18 stacks safe at the start of Level 220?
They are the recorded short opener wave and begin clearing the pink rails; the larger magenta 20 cards are held for the later handoff.
When should cyan be routed?
After a yellow or purple route has begun to drain, so the thin cyan X crossings have a free bay instead of waiting behind a solid pink queue.