How many balls does the Level 557 solution use?

The verified run spends 26 of 27 balls and clears the board with 1 remaining.

Why is the upper-right corner the best opener?

That side peels first and pulls the center columns down into a much lower cleanup pile.

The floor-level purple can, gray cubes, and the final white-red block usually survive the longest.

Smash Fest! level guide

expert Target: 26 moves 6 colors

Collapse the checkerboard wall from the upper-right wing and finish the base pile with 26 fired balls.

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Hit the upper-right gray corner and the rightmost white-red column to start opening the wall from that side.
Continue down the right edge until the upper-right stack tilts and the purple cans begin spilling into the middle.
Let the center columns fall into a lower pile, then break the exposed middle-right columns that are still standing.
Clear the floor pile across the platform: the purple can, loose white-red block, and nearby orange star crates that keep the heap propped up.
Remove the leftover left-side vertical stack and the low gray cubes only after the right and center pieces have settled.
Save the final shots for the last purple can and any isolated white-red block still standing on the base; finish with 1 ball.

Colors in this level:

Purple, White, Gray, Red, Gold, Blue

Trying to flatten the middle evenly instead of peeling the upper-right wing first.
Ignoring the low purple can and gray cubes until ammo is almost gone.

Board notes 5 details

Layout: A wide checkerboard wall mixes purple cans, white-red columns, orange star crates, and gray side blocks across a flat square platform.
Goal: Peel the right wing, drop the middle columns, and remove the floor-level purple can, gray cubes, and last white-red block.
Opening: Start on the upper-right gray corner and rightmost white-red column to make that wing buckle first.
Danger Zone: Early shots into the untouched left side waste ammo because the late survivors are the low purple can and gray base cubes.
Mechanics: A lattice wall with heavy side rails solves best through a right-edge peel followed by a long platform cleanup.

How many balls does the Level 557 solution use?
The verified run spends 26 of 27 balls and clears the board with 1 remaining.
Why is the upper-right corner the best opener?
That side peels first and pulls the center columns down into a much lower cleanup pile.
What are the last stubborn pieces?
The floor-level purple can, gray cubes, and the final white-red block usually survive the longest.