What is the purple outlined row for in Level 574?

Use it only as transit. Parking a large green shape there traps the blue staircase, and the final purple L and horizontal still need that row.

What should leave last?

After green clears, send the purple L through the left gate and the final purple horizontal block across the outlined row.

Block Out level guide

hard 5 colors

Hard Level 574 opens red 3 then green 3, clears yellow and blue before green, and saves the purple outlined-row sweep for last.

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Clear reachable yellow blocks upward and send red pieces through the top red gate.
Shift green off the right wall, free the red hook, and complete red 3.
Use the opened space to remove purple and blue blocks around the outlined cell row.
Route green pieces out until green 3 opens the lower board.
Clear broad yellow groups through the bottom yellow gate, then route the cyan-blue outlined L and loose blue blocks through blue.
Remove the last yellow corner, cyan outlined hook, and green outlined L while keeping the purple row open.
Clear the remaining solid green blocks through the top and left green exits.
Finish with the purple L-shaped group through the left gate, followed by the final purple horizontal block across the outlined row.

Colors in this level:

Red, Green, Yellow, Blue, Purple

Using the purple outlined row as a parking bay.
Moving the large green shape before blue leaves, or treating green as the finish when two purple pieces still remain.

Board notes 5 details

Layout: A tight upper-right pocket sits beside red 3 and above green 3, with mixed colors, outlined hooks, and a horizontal row of empty purple-outlined cells.
Goal: Open both shutters, clear yellow and blue before green, and preserve the outlined row for the final purple L and horizontal block.
Opening: Clear yellow upward, route red to the top gate, and move green away from the right wall.
Danger Zone: A large green shape parked over the lower junction traps the blue staircase and purple final piece.
Mechanics: Perpendicular red 3 and green 3 shutters share a board containing an embedded purple outlined cell row.

What is the purple outlined row for in Level 574?
Use it only as transit. Parking a large green shape there traps the blue staircase, and the final purple L and horizontal still need that row.
What should leave last?
After green clears, send the purple L through the left gate and the final purple horizontal block across the outlined row.