How many balls does the Level 574 clear use?

It fires 24 of 25 balls and clears the board with 1 remaining.

Where should the first shots go?

Open the upper-left cap and inner-left seam so the rectangle splits before you work on the right tower.

The late trap is the last purple barrel beside an isolated cyan cube on the right edge of the platform.

Smash Fest! level guide

expert Target: 24 moves 6 colors

Peel open the upper-left half, drop the right tower by its brown brace, and finish the stepped shelf with 24 fired balls.

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Break the upper-left cyan cap and the blocks just inside the left brown column.
Keep firing through that upper-left seam so the left top section caves in and a purple barrel drops through the center gap.
Remove the remaining left middle shelf and wait for the debris below the platform to settle.
Shift to the right half and hit the lower-right edge and brown outer column until the tall tower loses its side brace.
Trim the exposed right tower from the outside so it collapses into a lower stepped shelf.
Target the cyan cubes beneath the middle purple barrels to flatten the shelf instead of chasing the loose top barrel.
Spend the last cleanup shots on the remaining purple barrel and the isolated right cyan cube; finish with 1 ball left.

Colors in this level:

Brown, Purple, Cyan, White, Orange, Blue

Starting on the right tower while the left half is still a full rectangle.
Shooting the loose top barrel before removing the cyan cubes supporting the last shelf.

Open the upper-left seam before touching the right tower.
Break the right brown outer brace from low to high.
Shoot the cyan base under the last barrels instead of the rolling barrel itself.

Board notes 5 details

Layout: A full rectangle of cyan cubes and purple barrels surrounds a white-swirled center spine, with thick brown support columns on both outer edges.
Goal: Split the rectangle from the upper left, collapse the right-hand tower, and remove the last purple barrel plus the isolated cyan cube on the right lip.
Opening: Start at the upper-left cap and inner-left seam so the first half of the wall opens before the right tower is attacked.
Danger Zone: Early shots into the right tower waste balls while the rectangle is still fully braced, and late panic shots at the loose top barrel often leave its cyan base standing.
Mechanics: A side-release rectangle becomes a narrow tower, then a stepped shelf that must be cleaned from the support cubes upward.

How many balls does the Level 574 clear use?
It fires 24 of 25 balls and clears the board with 1 remaining.
Where should the first shots go?
Open the upper-left cap and inner-left seam so the rectangle splits before you work on the right tower.
What usually survives at the end?
The late trap is the last purple barrel beside an isolated cyan cube on the right edge of the platform.