How many cannonballs clear Royal Smash Level 15?

The verified walkthrough fires 13 balls from the starting 28 and clears with 15 remaining.

Which roof support should break first?

Open the far-right red can column so the long purple planks fold and slide clockwise off that side.

The roof collapse leaves red cans and a substantial blue-and-yellow brick wall on the platform, including isolated blue cleanup blocks.

Royal Smash! level guide

hard Target: 13 moves 4 colors

Release the long purple plank roof from its far-right red post, then budget the remaining shots for the blue-and-yellow brick foundation.

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Hit the upper section of the far-right red can column to loosen the roof corner.
Strike that right post again and wait as the purple planks fold and slide clockwise.
Break the next exposed red column toward the center so the remaining roof loses its middle support.
Let the overlapping planks fall off the right edge before firing again.
Remove the two red cans still standing on top of the blue-and-yellow foundation.
Break the raised yellow bricks that brace the blue row and allow loose bricks to drop away.
Clear the blue blocks from the center and right, then remove the last isolated blue survivor.
The platform empties after 13 shots with 15 balls still shown in the counter.

Colors in this level:

Purple, Red, Blue, Yellow

Attacking the blue-and-yellow base while all four red posts stand leaves the heavy roof intact above it.
Assuming the falling roof completes the level overlooks the red cans and blue blocks that remain on the foundation.

Break the far-right red roof post before touching the foundation.
Let overlapping purple planks slide fully off the edge.
Count the blue blocks still trapped between yellow bricks after the roof disappears.

Board notes 5 details

Layout: A 28-ball board has staggered long purple roof planks carried by four narrow red can columns above a two-course wall of blue and yellow rectangular bricks.
Goal: Slide the roof off to the right, remove the red cans still standing on the foundation, and dismantle the base down to its last isolated blue block.
Opening: Hit the upper part of the far-right red column twice so that post fails and the right end of the purple roof folds clockwise.
Danger Zone: The overlapping roof planks keep sliding after the posts break; shooting them in motion wastes balls needed for blue blocks braced inside the yellow foundation.
Mechanics: A counterweighted post-and-roof collapse reveals a separate layered-wall cleanup, making the surviving brick base more important than the dramatic upper fall.

How many cannonballs clear Royal Smash Level 15?
The verified walkthrough fires 13 balls from the starting 28 and clears with 15 remaining.
Which roof support should break first?
Open the far-right red can column so the long purple planks fold and slide clockwise off that side.
Why save shots after the purple roof falls?
The roof collapse leaves red cans and a substantial blue-and-yellow brick wall on the platform, including isolated blue cleanup blocks.