How do you make tiles impassable after the player leaves it?

[editor2s]

I'm making a game that when the player steps on a certain tile, when he leaves it, it will collapse and cannot be passed on again. Please help me do it.

[d-soldier]

Add a "COLLISSION FINISH" event to the tile, which after the collision with the PLAYER is finnished (he steps off) it:Moves-to (a lower Y coordinate); follows a path (goin down); etc. For this to work, the "tile" needs to be a seperate actor then the level-tiles you may or may not be using, so it can have these events.