How many balls does the Level 573 clear use?

It fires 20 of 25 balls and leaves 5 in reserve.

What should break first?

Open the lower-right stash so the yellow canisters and barrels spill away from the center base.

Because the last white cylinder and cyan cube can keep the final orange pile from disappearing until you target them directly.

Smash Fest! level guide

expert Target: 20 moves 6 colors

Burst the right canister stash, shorten the center tower, and clear the last orange pile in 20 shots.

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Break the lower-right support under the yellow canisters and shelf barrels so the stash spills outward.
Keep shooting through that opened right base until the central orange stack loses the shelf beneath it.
Pause while the right-side canisters and barrels roll off the board.
Shorten the surviving center white-and-orange tower until it folds into the left mini-stack.
Remove the last left support pieces and beam row so the fortress becomes a low barrel-and-beam pile.
Finish the tiny orange cluster, the upright white cylinder, and the last cyan cube with 5 balls left.

Colors in this level:

Orange, White, Purple, Blue, Yellow, Gray

Starting by shaving the left tower while the right stash still braces the center.
Assuming the orange pile is loose when one white cylinder and a cyan cube still support it.

Open the lower-right stash before attacking the left tower.
Wait for the right canisters and barrels to roll clear before hitting the center again.
Save late shots for the last barrel cluster, upright cylinder, and cyan cube.

Board notes 5 details

Layout: A castle-like pyramid combines two tall white side towers, stacked orange barrels up the middle, three wide beam rows, and a heavy yellow canister stash on the lower right.
Goal: Open the right stash first, collapse the center-and-left tower system, and remove the last orange barrels, white cylinder, and cyan cube from the tabletop.
Opening: The first hits go into the lower-right support cluster beneath the yellow canisters so that whole shelf spills outward.
Danger Zone: Early shots into the left tower waste balls because the middle orange stack and right stash remain locked together, and late cleanup still needs the final white cylinder support removed.
Mechanics: A split-fortress spill releases a heavy right stash first, then turns the rest of the castle into a low cleanup pile.

How many balls does the Level 573 clear use?
It fires 20 of 25 balls and leaves 5 in reserve.
What should break first?
Open the lower-right stash so the yellow canisters and barrels spill away from the center base.
Why does the fortress still survive after the first collapse?
Because the last white cylinder and cyan cube can keep the final orange pile from disappearing until you target them directly.