Sand Tetris: Unblocked
Real sand piles up at about 30-45 degrees. If you drop sand too quickly, it will avalanche. To clear lines, you need a perfectly flat top. So, alternate sand drops from left to right to create a level surface, like spreading pancake batter.
If sand builds too high on one side, it will avalanche. Keep the top relatively flat. Sand Tetris Unblocked
While every version is slightly different, the core mechanics remain the same: Real sand piles up at about 30-45 degrees