Where are the key pieces in Block Out Level 717?

The late upper-right reveal shows a cyan square and a yellow vertical with key symbols; route them before handling the purple padlocked block.

Why must the center stay open?

Both marked pieces and the long pink J need the single spine between the upper chambers and the bottom gates.

Block Out level guide

expert 8 colors

Level 717 hides a key-and-padlock wave behind four covers; empty the cyan basin and protect the center spine before the marked pieces appear.

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Send the accessible cyan horizontal through the left cyan gate and the small green horizontal through the bottom green gate.
Turn the bright green L through the lower basin without parking it under the red 1-cover, then clear the next exposed cyan bar.
Use the next green exits to take the upper-left 2-cover to zero and pull its reveal into the lower basin before filling center.
Reduce the small-left 6-cover, then move its red/orange and bent green reveal away from the left wall first.
Continue lowering the upper-right count while keeping the central spine and right orange notch open.
At the upper-right 0 reveal, move the cyan key square and yellow marked vertical into the open center before the long pink J crosses it.
Route the cyan key square to a cyan gate and the yellow marked vertical to its matching side, leaving the purple padlock block parked until it unlocks.
Send the red bent piece through the left red gate and the long pink J down through the bottom purple/pink gate.
Clear the upper cyan, yellow, purple, and green groups, then remove the unlocked purple block from the left side.
Finish the right-side cyan bar, then the lower-left green L and red vertical; the board empties into the Level 717 reward card.

Colors in this level:

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

Parking a long cyan bar across the center spine before the upper-right cover retracts.
Trying to move the purple padlock block before the cyan and yellow marked pieces complete their routes.

Leave the central spine empty when the upper-right counter is one exit from zero.
Process the two marked pieces before trying to move the purple padlock block.

Board notes 5 details

Layout: A stepped upper half holds covers marked green 2, upper-right 11, small-left 6, and central red 1. Long cyan bars, a green L, green horizontals, and purple pieces fill the exposed lower basin.
Goal: Open the green and small-left chambers, reduce the upper-right cover, then route its cyan and yellow key-marked pieces before releasing the purple padlock block.
Opening: Clear the lowest cyan bar through the left cyan gate, send a small green horizontal through the bottom green gate, and keep the bright green L away from the center spine.
Danger Zone: A cyan bar or long pink J parked beneath the red chamber blocks both key-marked pieces from reaching their side gates.
Mechanics: Four cover counters reveal a late key/padlock layer containing a cyan key square, yellow marked vertical, and a purple padlocked block.

Where are the key pieces in Block Out Level 717?
The late upper-right reveal shows a cyan square and a yellow vertical with key symbols; route them before handling the purple padlocked block.
Why must the center stay open?
Both marked pieces and the long pink J need the single spine between the upper chambers and the bottom gates.