Why is the right waist important in Block Out Level 715?

It is the only reliable passage between the staged reveals and the lower turning pocket, so it must be cleared after every transfer.

What is the last piece in the video?

A lime-green L exits through the top green gate after the late orange and red pieces, followed by the empty board and PERFECT card.

Block Out level guide

expert 8 colors

Level 715 starts three covers at 1/3/3 and zeros them with right-gate light cyan, bottom-gate light-blue L and right-gate purple exits.

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Exit the small cyan piece through the right cyan gate to change the middle/lower covers 3-to-2 while the top remains 1.
Remove the red block downward and unwind the framed pink/cyan bend through the bottom pink gate without parking it in the waist.
Send the pink block through the right cyan gate for middle/lower 2-to-1, then the short light-cyan piece through that gate to make only the lower cover 1-to-0.
Move the newly revealed lime-green L into the right route first, then unwind the pink and light-blue L shapes through the waist.
Exit the light-blue framed L through the bottom pink gate to make the middle cover 1-to-0; select the green horizontal below the orange 3-counter first.
Exit that green horizontal for orange 3-to-2, the small red square for 2-to-1 and the light-blue L for 1-to-0, exposing the yellow L.
Route the yellow L through the left yellow gate, then exit the purple horizontal through the right purple gate to make the top cover 1-to-0.
Pull the exposed light-blue framed L down first, then unwind the orange/green vertical, nested yellow/red and blue/orange L shapes and far-right red vertical.
Send the late orange and red pieces through matching exits while keeping the last lime-green L clear of the four brown non-piece cells.
Exit that final lime-green L through the top green gate; the empty board and Level 715 PERFECT card confirm completion.

Colors in this level:

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

Using the narrow right waist as parking while another reveal is still feeding pieces downward.
Crossing the brown-cell row with a framed horizontal before the revealed green horizontal and yellow L have left.

Restore the right waist after every long framed piece passes through it.
Remember the cover-zero gates: right cyan for the short light-cyan piece, bottom pink for the light-blue L, then right purple for the purple horizontal.

Board notes 5 details

Layout: Three horizontal covers start at 1, 3 and 3 above a stepped lower pocket containing cyan, blue, green, red, pink and framed bent pieces.
Goal: Zero the lower, middle and top covers with their observed trigger pieces, work the orange 3-counter beside four brown cells, then route the upper band.
Opening: Send the small cyan piece right, remove the accessible red block downward and unwind the framed pink-and-cyan bend through the bottom pink gate.
Danger Zone: A long framed piece parked across the one-cell right waist prevents the newly revealed green L shapes from reaching their gates.
Mechanics: The lower cover is zeroed by a short light-cyan exit at the right cyan gate, the middle by a light-blue framed L at the bottom pink gate, and the top by a purple horizontal at the right purple gate.

Why is the right waist important in Block Out Level 715?
It is the only reliable passage between the staged reveals and the lower turning pocket, so it must be cleared after every transfer.
What is the last piece in the video?
A lime-green L exits through the top green gate after the late orange and red pieces, followed by the empty board and PERFECT card.