Which cover should open first in Block Out Level 678?

Open the wide upper wooden cover first by clearing the exposed left spine; its right-hand reveal must be drained before the lower cover can finish.

Why must the bridge rows stay open?

They are the only crossings between the left spine and both covered chambers, so a long parked block can isolate the next reveal.

Block Out level guide

expert 9 colors

Level 678 links a wide upper wooden cover and a smaller lower cover through three bridge rows, ending in a framed pocket beside an S-shaped wall.

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Move the exposed red L to the left red gate, send the outer orange vertical through the left orange gate, and clear yellow through the bottom gate.
Separate the nested lime L shapes in the left spine and route them toward the left green gate without filling all three bridge rows.
Clear the remaining starter red, cyan, and orange pieces until the large wooden cover retracts; move the new upper-left yellow block first.
Send the reveal's edge pink piece through the left gate, then move the red L and long green vertical away from the bridges.
Clear the right-edge cyan and red pieces, followed by the orange cluster and brown-marked squares, using one bridge row at a time.
Route the long green L through the left green gate and the yellow L through the bottom yellow gate to continue reducing the lower cover.
When the lower cover reaches 0, reposition the framed pink L inside its pocket and send the adjacent cyan block through the right cyan gate.
Unwind the remaining red, green, yellow, and orange L shapes around the S-shaped corridor, one long piece across center at a time.
Clear the late upper cyan/orange blocks, then the right purple vertical and lower green bar through their matching gates.
Send the last cyan square and framed pink L out of the lower-right pocket before the Level 678 PERFECT card.

Colors in this level:

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

Parking a long green bar across the three bridge rows before the upper cover retracts.
Pulling the framed pink L out of its pocket while the cyan right-gate lane is still occupied.

Keep at least one white bridge row empty whenever a cover is close to zero.
Clear the right-edge cyan and red pieces before bringing a long L across center.

Board notes 5 details

Layout: A large upper wooden cover and smaller lower-right cover divide the board. The exposed left spine holds red/lime/yellow/orange L pieces, with three white counter bridges crossing toward the covered chambers.
Goal: Open the upper cover from the left spine, drain its dense right reveal while preserving the bridges, then open and clear the framed lower-right pocket.
Opening: Pull the free red L toward the left gate, clear the outside yellow/orange blocks, and separate the lime L stack without spanning all three bridges.
Danger Zone: A red L or tall green bar across the bridge rows blocks both reveal stages; the framed pink L must remain in its pocket until the adjacent cyan lane opens.
Mechanics: Two wooden covers reveal separate chambers through three shared counter bridges, leaving a permanent S-shaped corridor for the final transfers.

Which cover should open first in Block Out Level 678?
Open the wide upper wooden cover first by clearing the exposed left spine; its right-hand reveal must be drained before the lower cover can finish.
Why must the bridge rows stay open?
They are the only crossings between the left spine and both covered chambers, so a long parked block can isolate the next reveal.