What happens after the covers open in Block Out Level 667?

Two devices marked 3 release a late sequence of outlined bent blocks into the now-open board.

Where should the L shapes be turned?

Use the open shoulder beneath the former upper-left chamber and keep it free between shapes.

Block Out level guide

expert 9 colors

Level 667 opens covers marked 1, 11 and 12 before two 3-count devices release a late field of outlined bent blocks.

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Send the exposed lime block through the left green gate and clear reachable red and pink pieces through the bottom gates.
Move the orange horizontal away from the right cover, separate the lower L shapes and retract the red 1-cover.
Clear the revealed green, cyan and pink pieces while reducing the upper-left 11-cover.
After the left chamber opens, move orange, green and cyan blocks away from the shoulder before turning its outlined L.
Open the tall 12-cover and pull its purple, red, yellow, green and blue pieces down into the central field.
Route rectangular pieces through matching gates while keeping outlined bends in the upper half one at a time.
Reduce both 3-count shape devices, clearing each cyan, orange or purple bent release before the next arrives.
Send the remaining red/blue L shapes toward the side gates and purple pieces toward the right or bottom.
Remove the final orange L, purple L and blue corner blocks to empty the board.

Colors in this level:

Lime, Green, Pink, Red, Purple, Orange, Cyan, Blue, Yellow

Leaving the orange horizontal beneath the right cover when its chamber opens.
Releasing a second outlined bend while the first still occupies the upper-left shoulder.

Board notes 5 details

Layout: An 11-cover sits upper-left, a red 1-cover below it and a tall 12-cover upper-right. Lime/pink L shapes, red/purple blocks and an orange horizontal fill the starter; two shape devices show 3.
Goal: Open the three covered chambers, then use the full board to turn and exit the cyan, orange, purple, red and blue bent pieces released late.
Opening: Send lime left, clear reachable red/pink pieces through the bottom gates and move the orange horizontal away from the right chamber's foot.
Danger Zone: Parking an orange horizontal or broad cyan block under the upper-left shoulder prevents the outlined L pieces from turning toward their side gates.
Mechanics: Three covers expand the board before top and left 3-count shape devices release outlined bent pieces.

What happens after the covers open in Block Out Level 667?
Two devices marked 3 release a late sequence of outlined bent blocks into the now-open board.
Where should the L shapes be turned?
Use the open shoulder beneath the former upper-left chamber and keep it free between shapes.