As soon as a block touches the bottom or another piece, it loses its solid form and collapses into a pile of sand. To clear a "line," you don't just need a row of blocks; you need a continuous path of the same color stretching from the left wall to the right wall. Why is it So Popular?
The physics engine takes a second to calculate the "settling" of the sand. Wait for the sand to stop moving before placing your next piece. Sand Tetris Unblocked
The Ultimate Guide to Sand Tetris: Why This Viral Physics Puzzler is Taking Over As soon as a block touches the bottom