Help plz

I am making an adventure game and i want to make the roofs on houses dissapear when you walk in. I know how to setup everything. When i trigger the visiblity actuators with a collision sensor they only work once, then dont work again until i restart the game. Is there any thing i am doing wrong ? Or is my blender glitched because some of the features dont work for me.

they have such a .blend that demonstrates this in one of the game stickys…you could download that and compare…
Not that that helps much…

You need to make a setup that makes the roof visible again when you leave. Use an inverted collision sensor.

Or, make it fade away with a IPO with “flipper” selected in the IPO actuator.