What should I open first in Block Out Level 742?

Open the small 2-cover first; it provides the working space needed to reduce the much larger 12-cover.

What is the safest first move after the big reveal?

Pull the long purple vertical and nearby cyan piece down before handling the nested pink/yellow L pair.

Block Out level guide

expert 7 colors

Level 742 uses a small 2-cover to unlock the board before a 12-cover drops a packed crown of nested L shapes over a yellow-blue endgame.

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Send the first two small cyan squares through the bottom cyan gate, reducing the lower cover from 5 to 3 and then to 1 while preserving center.
Exit the short cyan rectangle through the bottom cyan gate for 1 to 0; move the revealed yellow-cored blue L first, then separate the green-cored yellow L.
Send red bars left, green pieces left, and cyan/blue rectangles through the bottom and right blue gates.
Move the green L around center as the 12-cover drops, clearing the tall yellow L only after its top route is straight.
At upper-cover count 3, send the three-cell green horizontal through the left green gate; its exit counts 3 to 2 to 1 to 0, then pull the revealed purple vertical and cyan block down.
Clear the upper pink/yellow shapes through their top gates, then send cyan and purple bars to side gates.
Work the lower field outside-in: blue pieces to blue gates, red pieces left, and large yellow pieces upward.
Finish with the isolated small yellow square through the top yellow gate before the PERFECT card.

Colors in this level:

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

Leaving the green L across the shelf when the 12-cover reaches 1.
Moving the lower yellow field into center before the crown's long purple vertical has crossed.

Board notes 5 details

Layout: Upper and lower covers visibly start at 15 and 5, then settle at 12 and 2 after the first cyan exits. Red/green bars, yellow and pink squares, cyan rectangles, and side/bottom gates fill the exposed strip.
Goal: Open the lower cover, reduce the 12-cover while keeping its staging shelf clear, then separate the crown from the yellow-blue lower field.
Opening: Send two small cyan squares through the bottom cyan gate for lower-cover 5 to 3 to 1, then line up the short cyan rectangle that supplies the final trigger.
Danger Zone: The row below the 12-cover is the only landing space for its purple/cyan crown; a green L or red bar left there traps the reveal.
Mechanics: A 2-cover creates the working board, then a 12-cover reveals nested pink/yellow L shapes and long purple/cyan pieces.

What should I open first in Block Out Level 742?
Open the small 2-cover first; it provides the working space needed to reduce the much larger 12-cover.
What is the safest first move after the big reveal?
Pull the long purple vertical and nearby cyan piece down before handling the nested pink/yellow L pair.