What opens the lower chamber in Block Out Level 578?

Clear the upper color groups to open the orange 2-shutter, then repeat the process for the purple 2-shutter beneath it.

How should I handle the blue-heavy endgame?

Remove the remaining yellow, purple, and red shapes first, then unfold the blue blocks into the empty center and feed them left.

Block Out level guide

expert 6 colors

Level 578 hides a blue-heavy lower chamber behind two 2-shutters; separate the nested outlined shapes before opening space for the late blue sweep.

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Clear exposed yellow through the top gate and cyan through the right gate, using the stepped left recess to park red and blue blocks.
Remove ordinary red, green, yellow, and blue pieces around upper center, then turn the outlined green/blue L left through the green gate.
Keep the nested yellow/purple pair low until the orange 2-shutter opens; separate it, send the small purple piece right, and clear the exposed yellow/red group upward.
Keep taking ordinary pieces until the purple 2-shutter reveals lower red bars, yellow L pieces, bottom outlined shapes, and the large blue field.
Use the right red gate for the lower red verticals and bars, then clear accessible green and yellow through their left/top gates before occupying center.
Lift the lower outlined shapes separately, clearing yellow/purple first and then raising the large yellow L through the top gate.
Start the blue sweep at the left gate, feeding horizontal bars and ordinary L shapes while turning the upper-right blue cluster through the empty middle.
Finish the blue-only tail through the lower-left gate with the outlined blue L/J and remaining small blue block.

Colors in this level:

Yellow, Cyan, Red, Green, Blue, Purple

Dragging the nested yellow/purple outlines across the upper center before ordinary red, blue, and green blocks have cleared.
Spreading the lower blue mass into center while yellow and purple outlined pieces still need to turn through it.

Keep the nested yellow/purple pair low until ordinary upper pieces have left.
After the lower reveal, remove non-blue outlined shapes before spreading the large blue blocks into center.

Board notes 5 details

Layout: A stepped upper pocket with top yellow and right cyan gates sits above orange 2 and purple 2 shutters. Nested green/blue and yellow/purple outlines lead into a lower field of large blue blocks.
Goal: Clear the upper colors to open both full-width shutters, lift the lower outlined shapes separately, then route the remaining blue mass to its late side gate.
Opening: Clear exposed yellow and cyan first, parking red and blue blocks in the stepped left recess until the outlined green/blue L can turn.
Danger Zone: The nested outlines cannot pass above the shutters, and the lower red bars, yellow L, outlined pieces, and blue mass all compete for the revealed middle.
Mechanics: A stepped board, consecutive orange and purple 2-shutters, changing gates, and nested outlined shapes control a blue-heavy endgame without boosters.

What opens the lower chamber in Block Out Level 578?
Clear the upper color groups to open the orange 2-shutter, then repeat the process for the purple 2-shutter beneath it.
How should I handle the blue-heavy endgame?
Remove the remaining yellow, purple, and red shapes first, then unfold the blue blocks into the empty center and feed them left.