How to move sprites or items every frame independently?

Pulp
1

Is there a way of moving items ans sprites when certain conditions apply?
For example, I want to make a boulder sprite or item fall down, when the underlaying sprite is "white".

Thanks in advance :wink:

2

I think I figured it out. I emit a custom even in the game script every frame and then redraw the two affected tiles using the event in the script of the boulder tile. Don’t know if this is the best way, but it works.