What opens first in Block Out Level 663?

The pink 1-cover in the neck opens first and reveals a small yellow-orange bridge wave above the purple 11-cover.

What is the key lane after the lower cover opens?

The one-cell neck remains the only exchange between the upper and lower chambers, so it must stay empty between moves.

Block Out level guide

expert 7 colors

Level 663 uses an hourglass board with a pink 1-cover above a purple 11-cover; clear each reveal without losing the one-cell neck.

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Clear the exposed upper yellow and green edge pieces, move cyan toward a side gate and separate the yellow L from the surrounding pink shape.
Send the red vertical through the left red gate and shift purple pieces along the top perimeter without filling the neck.
Take the pink 1-cover to zero, then remove the revealed yellow/orange bridge pieces before lowering a long cyan piece.
Route those bridge pieces through matching gates until the lower purple 11-cover retracts.
Pull the revealed cyan L upward from the left and move the pink horizontal away from the two marked bottom rows.
Alternate cyan and purple pieces through the neck, sending them to their right/left/bottom matching gates.
Turn the lower orange rectangle and yellow block through the open center without parking either across the neck.
Clear the remaining upper purple L and orange cluster after the lower cyan lane is empty.
Remove the last pink pieces through the left and bottom gates to empty the hourglass board.

Colors in this level:

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

Lowering a long cyan piece before the bridge's yellow and orange pieces have left.
Using the hourglass neck as a parking slot after the lower 11-cover retracts.

Return the hourglass neck to empty after every cross-board move.
Move the pink horizontal away from the marked lower rows immediately after the second reveal.

Board notes 5 details

Layout: A packed upper chamber narrows into a pink 1-cover, while a purple 11-cover hides the lower chamber. Green/cyan squares, red and purple bars, and nested yellow-pink L shapes fill the crown.
Goal: Open the neck cover, remove its bridge pieces, then reduce the lower cover and route both halves through the same narrow exchange.
Opening: Remove upper yellow/green edge pieces, send cyan toward a side gate and separate the nested L shapes while the red vertical approaches the left gate.
Danger Zone: A cyan vertical, purple L or pink horizontal parked across the neck traps the lower reveal and blocks the marked bottom rows' approach cells.
Mechanics: A 1-cover reveals a bridge wave before an 11-cover exposes a lower chamber with two visible marked horizontal rows.

What opens first in Block Out Level 663?
The pink 1-cover in the neck opens first and reveals a small yellow-orange bridge wave above the purple 11-cover.
What is the key lane after the lower cover opens?
The one-cell neck remains the only exchange between the upper and lower chambers, so it must stay empty between moves.