What opens the lower-left chained bay?

Completing the early yellow group releases its yellow lock and exposes the pink-and-blue stack.

Where does the green key come from?

It is attached to the upper-left column and is awarded when that column's red stage completes late in the solve.

The opened bay releases orange first and then reveals a white pair underneath.

Car Sort level guide

expert 10 colors

Car Sort Level 505 stages five horizontal car-icon trays between yellow- and green-locked lower bays on a fourteen-space U-road.

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Release green from the lower-center hidden stack, then route its pink, purple, and blue reveals into matching middle and lower positions.
Complete the yellow group in the lowest horizontal tray to open the yellow-locked lower-left bay.
Fill the lower-left pink and lower-center blue receivers, advancing the small counter from `2` to `1` and then clearing it.
Wait whenever occupancy reaches `14/14`, exposing the next car-icon row only after a receiver removes traffic.
Convert the five middle trays into solid yellow, white, green, blue, and lavender groups from top to bottom.
Complete the key-marked upper-left red stage and the upper purple column.
Collect the green key from that red completion, open the chained lower-right bay, and build the deeper upper-left cyan group.
Dispatch orange from the opened right bay, reveal its white pair, and send both into their late receivers.
Clear the remaining U-road traffic and confirm the level-completed transition.

Colors in this level:

Green, Pink, Purple, Blue, Yellow, White, Lavender, Red, Cyan, Orange

Opening a new car-icon row while the left return is already at `14/14`.
Expecting the green-locked lower-right bay to open before the key-marked top column completes.
Treating the small `2` completion counter as a tappable source.

Use the lower pink and blue completions to clear the early counter.
Expose only one horizontal shutter row after each receiver drain.
Save the lower-right orange and white source until the upper green key is earned.

Board notes 5 details

Layout: Three hidden top columns, five horizontal shutter trays, and three lower bays share a `0/14` U-road; the lower side bays are chained behind yellow and green locks.
Goal: Clear the lower hidden center, build five solid middle receivers, finish the key-marked upper-left red stage, and release the final orange and white cars before the deeper cyan stage closes.
Opening: Dispatch green from the lower-center stack, route its pink, purple, and blue reveals, then complete yellow to open the lower-left chained bay.
Danger Zone: At `14/14`, opening another shutter row or chained bay strands mixed traffic along the single left return.
Mechanics: Patterned car-icon trays, a completion-driven `2→1` counter, a yellow early lock, and a green-key late lock divide the solve into three waves.

What opens the lower-left chained bay?
Completing the early yellow group releases its yellow lock and exposes the pink-and-blue stack.
Where does the green key come from?
It is attached to the upper-left column and is awarded when that column's red stage completes late in the solve.
What is hidden in the final right bay?
The opened bay releases orange first and then reveals a white pair underneath.