How many balls are fired in the Level 505 walkthrough?

The run fires 25 of 28 balls and finishes with 3 remaining.

Why start at the upper-left corner?

Removing that gray cap and orange roof brace starts the shell strip across the top.

The striped side pieces and top gray caps tumble away after their orange roof braces break; firing at them mid-fall risks the three-ball margin.

Smash Fest! level guide

expert Target: 25 moves 6 colors

Strip the gray-capped fortress from the roof, collapse its orange-and-cyan core, and clear the final beam with 25 fired balls.

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Break the upper-left gray cap and the adjacent orange roof support.
Remove the orange roof crates toward the center so the striped left side piece and opposite gray cap can fall.
Break the exposed right outer cyan rail, then the slanted cyan beam leaning into the center.
Shoot the orange uprights beside the central gray slab stack until the fortress narrows to its core.
Pause while the heavy gray slabs fall, then open the lower cyan rail beneath the remaining red-and-orange column.
Clear the stationary gray slabs and red blocks from the left side of the low pile.
Remove the remaining cyan pieces without shooting the slabs that are still sliding.
Break all three final orange targets—the short beam and two small uprights; the video finishes with 3 balls.

Colors in this level:

Orange, Cyan, White, Red, Gray, Blue

Starting through the lower cyan center keeps the heavy gray roof and both walls standing.
Shooting a gray slab while it slides can leave too little ammunition for the orange finish.

Remove the upper-left gray cap before opening the cyan lower rails.
Pause when the wide shell narrows and again when the gray slabs reach the platform.
Keep the final balls for the short orange beam and two small orange uprights.

Board notes 5 details

Layout: A dense rectangular fortress combines orange star crates, cyan rails and blocks, white striped panels, red inner pieces, gray slab clusters, and striped rocket-shaped side pieces.
Goal: Drop both roof caps and side walls, reduce the fortress to its narrow core, then clear the low gray, cyan, red, and orange remnants.
Opening: Break the upper-left gray cap and adjacent orange roof support, then work across the top so both heavy corners lose their bracing.
Danger Zone: Opening through the lower center leaves the heavy roof intact, and firing at a sliding gray slab is costly in this near-ammo-limit run.
Mechanics: A roof-first shell strip converts a wide fortress into a narrow core and then a three-target orange finish.

How many balls are fired in the Level 505 walkthrough?
The run fires 25 of 28 balls and finishes with 3 remaining.
Why start at the upper-left corner?
Removing that gray cap and orange roof brace starts the shell strip across the top.
Which large pieces should gravity remove for free?
The striped side pieces and top gray caps tumble away after their orange roof braces break; firing at them mid-fall risks the three-ball margin.