How much ammunition does this solution use?

It fires 26 of 27 balls and clears with 1 remaining.

Which direction should the central tower fall?

Open its upper-right side so the orange-and-gray column folds into the striped staircase.

Small white-and-red striped blocks on the narrowing right staircase survive after the cyan wall falls.

Smash Fest! level guide

expert Target: 26 moves 5 colors

Fold the orange-and-gray center into the striped stairs, then grind down the cyan wall with 26 fired balls.

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Break the lower orange star crates supporting the central column.
Strike the upper-right orange crates and adjacent striped blocks so the top folds right.
Open the two dark-gray core blocks and wait for the orange tower to crumple.
Clear exposed cyan blocks from the left wall while the loose orange base slides away.
Return to the white-and-red staircase and remove its lower supporting steps.
Alternate between the remaining cyan ledge and orange base pieces, shooting only stationary targets.
Use the final shots on the small striped right-edge survivors until the platform clears.

Colors in this level:

Cyan, Orange, Gray, White, Red

Starting on the dense cyan wall leaves the central orange column standing and burns scarce ammunition.
Rapid shots into the moving center collapse leave too few balls for the striped right staircase.

Board notes 5 details

Layout: A massive cyan wall stands left of a tall orange star-crate column with two gray core blocks, while striped white-and-red stairs rise on the right.
Goal: Collapse the center tower, clear the cyan mass, and remove every surviving striped stair from the platform.
Opening: Loosen the lower orange base, then break the upper-right orange crates so the column folds toward the staircase.
Danger Zone: Attacking the thick cyan wall before the center folds leaves the orange base protected and risks exhausting the 27-ball supply.
Mechanics: An asymmetric counterweight collapse becomes a long two-front cyan-wall and striped-stair cleanup.

How much ammunition does this solution use?
It fires 26 of 27 balls and clears with 1 remaining.
Which direction should the central tower fall?
Open its upper-right side so the orange-and-gray column folds into the striped staircase.
What needs the final shots?
Small white-and-red striped blocks on the narrowing right staircase survive after the cyan wall falls.