Advancing wall of doom

How do I make an advancing wall of doom?

Ex: youtube.com/watch

Ex: static.tvtropes.org/pmwiki/pub/images/Kid_Chameleon.gif

I have a wall on the foreground layer and wallbox on the main layer, and I've set it up like the player and enemy movement according to the platformer tutorial.

But the wall doesn't move, it just flickers when the player touches it.

Wall set position to wallbox

Wallbox has the added variable to move right

Simulating platform movement

What am I doing wrong?

Instead of giving the wall object the 'Platformer' behaviour and simulating movement, why don't you try giving it the 'Bullet' behaviour?

nickname Platform will stop against solid objects.

Thanks, it works :)