What is the confirmed opening order on Level 52?

The reviewed MP4 shows pink 20 in slot 1, pink 40 in slot 2, black 20 in slot 3, and green 10 in slot 4.

Why does Level 52 continue after the butterfly looks empty?

The black outline continues to arrive as separate fragments, so the last black capacity countdown must release before completion.

Pixel Drop: Bus Puzzle level guide

hard 4 colors

Level 52 opens a green-pink-yellow butterfly with pink 20, pink 40, black 20, and green 10, then ends in a black-outline cleanup.

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Place pink 20 in slot 1 and pink 40 in slot 2, then take black 20 into slot 3.
Add green 10 to slot 4 only after the pink pair has started draining, leaving slot 5 open for the next wing color.
Feed yellow and green buses as their matching wing bands separate; alternate sides instead of stacking every pink bus.
When the central body becomes a thin dark bridge, let a black bus release before committing the next color.
At the tail, clear the visible black 1 and red-pink 1 counters and the other black buses, including the black 10 that counts down to 6 in slot 4.
Wait for the last black bus to depart and the five slots to empty; the MP4 then shows the COMPLETE card.

Colors in this level:

Green, Pink, Yellow, Black

Filling slots 1 and 2 with pink and immediately occupying every remaining slot with black.
Ignoring the yellow and green wing bands until the black outline has already consumed the parking row.
Stopping when the butterfly wings disappear instead of checking the black tail counters.

Start with the pink 20 and pink 40, then let black 20 open the central outline.
Keep slot 5 open while green and yellow bands separate from the wings.
Plan for a black one-counter and black six-counter finish after the colors have gone.

Board notes 5 details

Layout: A mirrored butterfly uses a black outline and body, bright green wings, pink inner bands, and yellow curves. The first visible row is pink 20, black 20, pink 20, pink 20, and green 10; the next row includes pink 40, green 20, yellow 10, green 10, and yellow 10.
Goal: Open both pink wings, route the green and yellow bands, and reserve enough capacity for the black outline fragments that remain at the end.
Opening: The observed opening places pink 20 in slot 1 and pink 40 in slot 2, then black 20 in slot 3 and green 10 in slot 4 while the butterfly is still intact.
Danger Zone: Pink buses can fill the row before the green and yellow wing bands have a release path. The late black outline is a real remaining stream, not an empty-board artifact.
Mechanics: The central butterfly body bridges two overlapping wing streams. Pink and green buses may look full while black outline pixels are still arriving, so departure timing controls the five-slot parking row. Bus numbers are capacity countdowns, not move counts.

What is the confirmed opening order on Level 52?
The reviewed MP4 shows pink 20 in slot 1, pink 40 in slot 2, black 20 in slot 3, and green 10 in slot 4.
Why does Level 52 continue after the butterfly looks empty?
The black outline continues to arrive as separate fragments, so the last black capacity countdown must release before completion.