Why is Level 393 split into checkpoints?

The 400 gate opens first, but each embedded 100 counter releases another mixed wave around the flame, sword and glove.

When should red 50 start?

Launch it beside short cyan cards and with one hole still empty, not beside two other long cyan stacks.

Colony Flow! level guide

hard 8 colors

Pace repeated cyan routes through a 400 gate and two embedded 100 counters, then separate the flaming sword, purple hilt and white glove.

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Tap cyan 50 and one cyan 25; leave the second cyan 25 waiting until a hole returns.
Route white 16 and cyan 10 while the 400 gate falls through the 300s.
Add red 50 alone beside short cyan 11/23/27; keep one hole free for the first 100-counter release.
Use yellow 15 and orange 24 for the flame core, then alternate red 15/30 with cyan 30/35.
Continue cyan 25/35/50 until the 400 gate reaches zero, clearing each short release before another long stack.
Route purple 12/23 and dark 23/40 as the sword edge and glove outline become exposed.
Clear the first embedded 100 with red 28/30 and white 16/40, then turn the next cyan wave over.
Resolve the second 100 using orange 11/24, yellow 10/15 and red 18/30 without filling the fifth hole.
Work late cyan 30/50 and white 35/40 through the glove while purple and dark fragments remove the hilt.
Finish the red flame tips, white fingers and final cyan border, then wait for the board to empty.

Colors in this level:

Cyan, White, Red, Orange, Yellow, Purple, Dark purple, Brown

Opening red 50 beside multiple cyan 50 routes removes the buffer needed by a 100-counter release.
Clearing the 400 gate does not finish the two embedded 100 counters or the glove and hilt.

Board notes 5 details

Layout: A white-gloved hand grips a purple-edged sword beneath a red, orange and yellow flame on a cyan field. A cyan-framed brown gate reads 400, and two embedded counters read 100. Five holes face cyan 50; the queue includes white 16, cyan 25/25/10, red 50, yellow 15 and more cyan 25/35/50.
Goal: Drain the cyan field and 400 gate, resolve both 100 counters, then clear the white glove, purple sword, flame and dark outline.
Opening: Launch cyan 50 and one cyan 25, delay the second cyan 25, and route white 16 through the first returned hole.
Danger Zone: Repeated cyan 35/50 stacks overlap red 50 and both 100-counter releases. Running several long routes together can occupy every hole for a full phase.
Mechanics: One external 400 gate and two embedded 100 counters divide the long board into cyan-field, flame-and-sword and white-glove checkpoints.

Why is Level 393 split into checkpoints?
The 400 gate opens first, but each embedded 100 counter releases another mixed wave around the flame, sword and glove.
When should red 50 start?
Launch it beside short cyan cards and with one hole still empty, not beside two other long cyan stacks.