Solid

Solid is one of the available behaviors that can be added on the movement tab. It defines if the actor's collision can be passed through or not. It will not work if the actor does not have collision since it cannot solidify something that does not exist.

Solid is typically used for the collisions of Dynamic actors. If actors with Fixed Movement and/or No Movement collides with each other, it will not work and they will only move through each other. Only Dynamic actors cannot move through Solid actors. (unless it gets squeezed, then it might flew off)

The solidity of an actor is disabled by default. Adding Solid to disable it to remove the actor's solidity is unnecessary.

Solid is a behavior and can be indirectly modified using the Enable Behavior and Disable Behavior functions from the Logic tab.