How many balls does the Level 575 clear use?

It fires 16 of 20 balls and leaves 4 in reserve.

Which side should open first?

Start on the right orange brace, then move to the left brace once the right frame has thinned.

The last narrow strip still stands on a base of orange drums, one cyan cube, and a short white cylinder until those supports are removed.

Smash Fest! level guide

expert Target: 16 moves 5 colors

Peel the right frame, shave the left brace, and clean the tall center strip in 16 shots.

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Break the right orange outer brace so the rectangle starts opening on that side.
Keep trimming the right frame until the center grid is exposed but still standing as one panel.
Shift to the left orange brace and remove that outer support so the wall can no longer stay rectangular.
Let the panel collapse into a thinner center strip and then shoot the lower support cubes and drums beneath it.
Work bottom-up through the exposed strip until only a short base stack remains with one orange drum, one cyan cube, and one white cylinder.
Finish the last orange drum and cyan cube beside the short cylinder, then remove the remaining base support with 4 balls left.

Colors in this level:

Orange, White, Purple, Cyan, Blue

Treat the orange side braces as the real targets, not the center grid.
After the right frame opens, move to the left brace before shooting the middle.
Break the base drums and support cubes under the thin strip before chasing top leftovers.

Board notes 5 details

Layout: A rectangular wall of cyan cubes and white-purple slabs is boxed in by orange outer braces, a full top row of orange barrels and white cap blocks, and a blue-and-orange drum row along the bottom.
Goal: Remove both outer braces so the center grid narrows into one tall strip, then clear the last orange drum, cyan cube, and short white cylinder at the base.
Opening: Open the right orange brace first so the wall starts losing its frame without wasting shots on the intact center grid.
Danger Zone: Center shots do very little while both orange side rails are intact, and the final base drums still support the strip even when the middle looks almost gone.
Mechanics: A double-frame peel strips one outer brace, then the other, before the thin center strip can be finished from the bottom up.

How many balls does the Level 575 clear use?
It fires 16 of 20 balls and leaves 4 in reserve.
Which side should open first?
Start on the right orange brace, then move to the left brace once the right frame has thinned.
What is the real late-game blocker?
The last narrow strip still stands on a base of orange drums, one cyan cube, and a short white cylinder until those supports are removed.