Why does Level 17 become a few floating cubes?

Removing the target groups releases the orange-brown cover and re-presents the remaining colored pieces as a sparse arrangement.

Can I ignore the buffer near the end?

No. The board is smaller, but the target order still matters and an occupied slot can block the final group.

Cube Tap Sort level guide

hard 11 colors

Break Level 17's orange-brown covered block with the blue and yellow opening targets, then follow its fast-changing late groups.

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Clear the exposed side blue 3 and yellow 3 groups from the opening target row.
When the block shifts automatically, take the red/pink groups named by the new row.
On the separated side bands, take pale blue and then gray only when those boxes are active; the orange-brown cover is still a depth boundary.
Before the sparse red and pale end, keep one buffer slot open; a smaller silhouette does not release cubes already stored in the row.
Clear the last red and pale cubes from the isolated lower pieces after their target boxes appear, then wait for the checkmark and WELL DONE animation.

Colors in this level:

Blue, Yellow, Red, Pink, Cyan, Gray, Purple, Green, Orange, Peach, Lavender

Start with the exposed side blue 3 and yellow 3 groups, not the nearest brown cover.
After each automatic block shift, read whether red/pink or pale blue/gray is active before tapping.
Check the buffer before the sparse red and pale end groups; a small board can still jam.

Board notes 5 details

Layout: The opening board is a broad orange-brown covered block with colored bands exposed around its sides. Blue 3 and yellow 3 are active, and the buffer row is empty.
Goal: Advance from blue/yellow into red/pink, pale blue/gray, and the final red and pale groups as the block collapses.
Opening: Start with the exposed blue and yellow groups shown in the first target row.
Danger Zone: The target row changes quickly after the cover breaks; the small late arrangement can still strand a stored cube if the order is ignored.
Mechanics: The large covered block automatically collapses into a sparse floating arrangement as target groups clear; no manual swipe is introduced in the source. The rapid target changes matter more than the shrinking silhouette.

Why does Level 17 become a few floating cubes?
Removing the target groups releases the orange-brown cover and re-presents the remaining colored pieces as a sparse arrangement.
Can I ignore the buffer near the end?
No. The board is smaller, but the target order still matters and an occupied slot can block the final group.