What is the key lane in Block Out Level 673?

The center-bottom passage beside the framed purple block is shared by the blue 4-cover reveal and the final U/L shapes, so it must stay empty.

Which part of Level 673 should be cleared first?

Clear the exposed right wing first; its exits open the upper-right 8-cover and create the room needed to work the orange upper-left cover.

Block Out level guide

expert 8 colors

Level 673 divides a tall board behind 7-, 8- and 4-covers plus a framed purple block; every reveal must pass through the same bottom-center corridor.

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Move the exposed red vertical through the right red gate, lower the yellow strip toward the bottom gate and lift the large green L into the new space.
Route the pink/red L shapes along the right edge and clear orange/blue starter pieces until the upper-right 8-cover opens.
Remove the revealed purple horizontal, green corner and red vertical through their top and right gates while leaving the center column empty.
Work from right to left, sending yellow and cyan pieces out before the orange 7-cover reaches zero and reveals its left-side group.
Clear the revealed blue square and red/green L shapes through side gates, then bring the cyan corner down without parking beside the framed purple block.
Alternate upper exits until the blue 4-cover reaches zero, then feed its lower-left wave through the open bottom-center passage.
Move the framed purple block after the passage clears and separate the late orange L, purple U and green corners into matching lanes.
Send the outlined purple U and final green L through their gates after the orange L leaves; the board then clears.

Colors in this level:

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

Parking a cyan L between the blue 4-cover and framed purple block before the lower-left chamber opens.
Leaving a long green L across the upper middle while trying to serve both right-side gates.

Leave the center column empty after each transfer instead of using it as a parking bay.
Clear long green pieces from the upper middle before opening another cover.

Board notes 5 details

Layout: An orange 7-cover and purple 8-cover occupy the upper board above a blue 4-cover on the left. The exposed right wing holds green, red, orange, yellow and pink L-shaped pieces around a narrow bottom pocket.
Goal: Clear the right wing, open the upper-right and upper-left covers, then reserve the center passage for the blue lower-left reveal and framed purple pocket.
Opening: Send the red vertical to the right gate, lower the yellow strip toward the bottom gate and lift the large green L into the released upper-right space.
Danger Zone: A cyan or purple L beside the framed purple block seals the only route from the blue 4-cover to the bottom gate.
Mechanics: Three numbered covers create separate upper-right, upper-left and lower-left waves that all feed one narrow center-bottom passage.

What is the key lane in Block Out Level 673?
The center-bottom passage beside the framed purple block is shared by the blue 4-cover reveal and the final U/L shapes, so it must stay empty.
Which part of Level 673 should be cleared first?
Clear the exposed right wing first; its exits open the upper-right 8-cover and create the room needed to work the orange upper-left cover.