I am making a clone based sandbox game called Fire Sandbox( https://scratch.mit.edu/projects/529031467/ ). The game features three types of moving elements: sand, fire, and water. While the sand works fine, as it only moves up and down, not sideways, the water and fire destroy each other when moving around. Just check the project and place some water and fire to see what I mean.

Not shared

The link was just messed up.