How many balls does the recorded solution use?

It fires 20 of 28 balls and finishes with 8 remaining.

Why start on the upper-left?

Removing the navy counterweight there makes the tall red-and-pink spine fold into the cleared space.

Strike the pink cylinder after opening the low red frame; its burst drops the final navy slab.

Smash Fest! level guide

expert Target: 20 moves 5 colors

Peel away the navy left counterweight, fold the tall red-beam tower, and expose the final pink cylinder with 20 fired balls.

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Break the upper-left navy blocks beside the first red star beam.
Continue downward through the exposed navy left edge so the upper tower leans left.
Pause while the loose navy slabs and red beams fall away from the pink right column.
Remove the remaining navy pile resting across the lower red frame.
Break the right red star beam so the two low navy slabs and pink cylinder are fully exposed.
Remove the loose red beam end and wait for the left navy slab to slide away.
Strike the pink cylinder between the remaining navy slabs; its burst knocks the last low navy slab off and ends the level with 8 balls.

Colors in this level:

Navy, Red, Gold, Pink, Blue

Shooting the pink right column before removing its navy protection spends balls without starting the collapse.
Chasing falling navy slabs makes shots miss the stationary red base frame.

Board notes 5 details

Layout: Alternating red-and-gold star beams and navy block rows form a tall tower, with pink cylinders protected along the right and two long red base beams.
Goal: Remove the navy counterweight, open the low red frame, and burst the exposed pink cylinder so the last navy slab falls.
Opening: Break the upper-left navy blocks and continue down that edge so the tower leans into the opened side.
Danger Zone: Early shots at the protected pink right column waste balls while the navy slabs still support the tower.
Mechanics: A one-sided counterweight collapse turns the tall alternating stack into a short red-frame cleanup.

How many balls does the recorded solution use?
It fires 20 of 28 balls and finishes with 8 remaining.
Why start on the upper-left?
Removing the navy counterweight there makes the tall red-and-pink spine fold into the cleared space.
What is the final cleanup target?
Strike the pink cylinder after opening the low red frame; its burst drops the final navy slab.