Which counters define Level 260?

The video shows 2, 9, 12, 17, 3, 7, and 15 across the upper, central, and lower trays.

What is the final placement?

After the orange, green, and blue pieces clear, place the two white receivers into the right terminal cells.

Sand Blocks level guide

expert 9 colors

Level 260 drops the 2 tray, works the 17/3/7/15 pink cluster, then empties tray 12 before the white terminal cells.

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Fill the red square beneath the left tube and wait for its 100% clear; the top-left 2 tray falls to 1.
Catch the yellow horizontal under the upper-right tube while leaving the far-right white column empty.
Place the green vertical in the left-center slot and blue stair along the right-center wall; wait for both clears to reduce the 17/3 pair.
Fit the yellow bar across the center, then the orange horizontal above it, exposing pink 7 and 15 while keeping orange out of the lower turn.
Drain pink 7 and 15 from top to bottom and wait for the unlock flash before opening lower tray 12.
Use tray 12 for the purple cap and cyan/blue pieces in sequence, keeping the central blue lane free until tray 12 reaches 0.
Place the orange L in the lower-right corner, then clear the remaining green and blue verticals in their bottom footprints.
Place the two white receivers in the narrow right terminal cells only after all colored sand is gone and verify completion.

Colors in this level:

Red, Yellow, Green, Blue, Pink, Orange, Purple, White, Cyan

Board notes 5 details

Layout: Dark purple board with red left and yellow right feeds, top-left tray 2, lower tray 12, orange bars, green/blue pieces, yellow center bar, pink 17/3/7/15 receivers, and a narrow white terminal column.
Goal: Empty the small upper 2 path, cycle the central numbered receivers, then open lower tray 12 while preserving the right white landing lane.
Opening: Clear the red square under the left tube so 2 falls to 1, then the yellow horizontal; clear the green and blue pieces beside pink 17/3 before using tray 12.
Danger Zone: The orange L cannot enter the center turn while 15 and 7 remain occupied; the right white cells are terminal landings, not early storage.
Mechanics: Counters 2/9/12/17/3/7/15, dual feeds, central cross-lane staging, and a white two-cell terminal finish.

Which counters define Level 260?
The video shows 2, 9, 12, 17, 3, 7, and 15 across the upper, central, and lower trays.
What is the final placement?
After the orange, green, and blue pieces clear, place the two white receivers into the right terminal cells.