What are the four large purple panels?

They are completion-triggered car-icon shutters that clear in green, cyan, blue, then orange order and reveal lower rows.

Why does the road fill so quickly?

It starts at `12/14`, and each covered group can add a matched pair before another receiver drains.

The final white cars complete the lower-left receiver alongside the last red group before the three-star card.

Car Sort level guide

expert 11 colors

Car Sort Level 550 combines a fourteen-space vertical road, four staged car-icon shutters, covered pairs, and long receivers on both sides.

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Send the exposed green road cars into the upper-left receiver.
Match visible blue, light-cyan, white, brown, pink, and green without opening every covered row.
Complete brown and use the drain to extend upper green and pink.
Complete the required receivers so the four car-icon shutters clear automatically in green, cyan, blue, then orange order.
Build right blue and purple while holding the left lavender row for tied cars.
At `12/14`, pause every new reveal until a receiver completes.
Finish right cyan, then complete pink, blue, and purple for the late yellow/orange wave.
Release the remaining tied yellow/orange and white groups only into clear target rows.
Complete right yellow and orange, then finish left lavender and red.
Send the final white cars left, confirm the last red/white checks, and verify the three-star completion card.

Colors in this level:

Green, Blue, Light-cyan, White, Brown, Pink, Lavender, Purple, Yellow, Orange, Red

Describing the car-icon shutters as freely tappable instead of completion-triggered.
Releasing a covered pair without a matching long receiver ready.
Filling the road before the final white and red groups become accessible.

Let completions trigger the green, cyan, blue, then orange shutters; they are not freely opened.
Keep the long green, brown, and cyan rows moving as capacity anchors.
Reserve late space for the tied yellow/orange and final white/red waves.

Board notes 5 details

Layout: Four left bays, three right bays, and four lower car-icon shutters flank a curved vertical road starting at `12/14`.
Goal: Trigger the four completion shutters in green→cyan→blue→orange order, uncover question-mark pairs, release tied cars, and complete eleven long color receivers.
Opening: Route green first, then match visible blue, light-cyan, white, brown, pink, and green pairs only into ready rows.
Danger Zone: The road repeatedly returns to `12/14`; another hidden pair can consume both spare spaces before a receiver drains.
Mechanics: Four completion-triggered car-icon shutters clear in green→cyan→blue→orange order; question-mark covers, rope restraints, and long eight-car receivers control the remaining solve.

What are the four large purple panels?
They are completion-triggered car-icon shutters that clear in green, cyan, blue, then orange order and reveal lower rows.
Why does the road fill so quickly?
It starts at `12/14`, and each covered group can add a matched pair before another receiver drains.
Which groups finish the level?
The final white cars complete the lower-left receiver alongside the last red group before the three-star card.