How many balls are fired in the Level 502 video?

The run fires 19 of 28 balls and finishes with 9 remaining.

Why does the source upload say Level 50?

The upload title omits the final digit, but its description and next-level screen identify the gameplay as Level 502.

The detached striped cylinders and cone-tipped pieces roll off the shallow platform without direct hits once their cyan supports break.

Smash Fest! level guide

expert Target: 19 moves 5 colors

Drop the right striped wing of the cyan ice scaffold, collapse its upper rows, and clean the last far-right block with 19 fired balls.

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Strike the outer-right red-and-white striped support so the hanging wing folds away.
Break the exposed right-center cyan support and wait for the upper striped row to fall.
Work across the remaining central and left supports, letting each cylinder cluster settle before firing again.
Remove the large cyan base sections once the upper scaffold is no longer protecting them.
Break the short cyan sections trapped under the two remaining striped-cylinder groups.
Clear stationary striped cylinders and cyan blocks from left to right while loose cylinders roll away.
Shoot the final far-right cyan block; the recorded clear leaves 9 balls.

Colors in this level:

Cyan, Red, White, Blue, Gray

Attacking the center before the hanging right wing falls leaves both upper striped rows supported.
Shooting a rolling striped cylinder spends ammunition needed for the last cyan blocks.

Board notes 5 details

Layout: A wide cyan scaffold carries red-and-white striped cylinders and cone-tipped pieces, with a hanging striped wing on the right and thick cyan base blocks below.
Goal: Release the right wing, collapse the upper striped rows, and clear every stationary cyan block and striped cylinder.
Opening: Hit the outer-right striped support first, then break the newly exposed right-center cyan support.
Danger Zone: The thick central cyan column remains braced until the right wing falls; do not chase striped cylinders while they roll.
Mechanics: A side-wing release converts a high striped scaffold into several low rolling-cylinder cleanup piles.

How many balls are fired in the Level 502 video?
The run fires 19 of 28 balls and finishes with 9 remaining.
Why does the source upload say Level 50?
The upload title omits the final digit, but its description and next-level screen identify the gameplay as Level 502.
Which moving pieces should be left alone?
The detached striped cylinders and cone-tipped pieces roll off the shallow platform without direct hits once their cyan supports break.