Which cover opens first in Block Out Level 636?

The red cover marked 5 opens when the last red horizontal exits through the bottom red gate.

What is the final object?

After the yellow/brown groups, purple piece, and yellow L, the pink horizontal exits through the left pink gate.

Block Out level guide

expert 8 colors

Level 636 resolves red 5 and purple 2 in sequence, then drains an outlined-grid wave whose last object is a pink horizontal at the left pink gate.

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Send the bottom-right red square through the bottom red gate, then clear the second red square and right red L while the nested yellow/cyan L remains at lower-left.
Move blue toward the right cyan lane and slide the straw 34-bar; send the last red horizontal through the bottom red gate to take red 5 from 1 to 0.
Move the newly accessible purple square into lower center, then peel right-side red and pink away without filling the left step.
Clear cyan/blue, yellow rectangles, and the large blue L, then carry the long green framed horizontal fully toward its side route.
Send the final purple square through the left purple gate with purple 2 at 1; the cover reaches 0 and reveals the upper outlined-grid wave.
Move the newly revealed green 2-by-2 downward first, then clear edge-aligned blue, green, yellow, and red pieces.
Drain the outlined brown grid and straw groups while routing pink, cyan, and framed corners one at a time through center.
In the terminal sequence, clear the remaining yellow and brown groups, then send the purple piece through its matching route.
Remove the yellow L next, but leave room for the still-present pink horizontal.
Move the pink horizontal left and send it through the left pink gate as the final object; the verified board is empty.

Colors in this level:

Red, Purple, Yellow, Cyan, Blue, Green, Pink, Brown

Parking a framed piece in the stepped junction before the final purple square reaches the left gate.
Calling the yellow L the finish even though the pink horizontal still remains.

Keep the left step and right cyan column empty as permanent transit lanes.
After the yellow L, audit the remaining pink horizontal instead of ending early.

Board notes 5 details

Layout: A red 5-cover and wider purple 2-cover sit above a stepped starter containing red pieces, a nested yellow/cyan L, blue and purple blocks, and a straw 34-bar.
Goal: Preserve the red-five exit chain, keep both stepped lanes open through the middle wave, then zero purple 2 and finish the full upper-grid sequence.
Opening: Clear the red starter through the bottom red gate, with the last red horizontal taking red 5 from 1 to 0 while blue stays near the right cyan route.
Danger Zone: A framed piece across the left step or right cyan column blocks the purple square and removes the turning room needed by the final grid wave.
Mechanics: The final purple square exits through the left purple gate at 1; the reveal starts by moving the new green 2-by-2 downward and ends only after a pink horizontal uses the left pink gate.

Which cover opens first in Block Out Level 636?
The red cover marked 5 opens when the last red horizontal exits through the bottom red gate.
What is the final object?
After the yellow/brown groups, purple piece, and yellow L, the pink horizontal exits through the left pink gate.