Step 1: Direct the initial sand stream and the yellow ball to the lower-middle section, bypassing the top-middle obstacle.
Draw a continuous, slightly downward-curved line starting from directly below the sand source on the left. Extend it rightwards and then curve downwards, ensuring it guides the sand *under* the first square-shaped obstacle and ends near the large open area in the bottom-middle.
The yellow ball and initial sand stream flow smoothly along the drawn line and accumulate in the open area below the first obstacle.












