Sand Blocks Level 21

Initial board state with numbered blocks covering sand bins.

Place the blue receiver on the bottom right to collect blue sand as numbered blocks clear.

Move the red receiver to the bottom right and the brown receiver to the bottom left to clear numbers.

Position the red receiver under the right sand column to collect red sand.

Move the blue receiver to the bottom to collect blue sand from the left column.

Position the blue receiver under the left sand area to empty remaining blue sand.

Use the green and yellow receivers to collect the top sand reservoirs and finish the level.