Make it deadly

1. A horizontal plane laser which is activated every five seconds in a whole chamber(1 meter above the ground)
2. At a very important position, The turret that can't be destroyed by ordinary ways(portal, punnel, jel, pick, etc) It can be destroyed only by security camera(which can be separated from the wall by portal gun).
3. Minimum number of panels that can be stepped on(The rest is water)
4. The button that can't push normal ways(button located on ceiling) and also no funnel.
(It can be pushed only by blue gel-stained cube)

Originally posted by GONY:

Make it deadly

2. At a very important position, The turret that can't be destroyed by ordinary ways(portal, punnel, jel, pick, etc) It can be destroyed only by security camera(which can be separated from the wall by portal gun).
4. The button that can't push normal ways(button located on ceiling) and also no funnel.
(It can be pushed only by blue gel-stained cube)

In order for the turret, the only way i can think of is with Hammer Editor (I dont mess with Bmod however)

For the button, cubes bounce in a random direction, and thats unnecessarily difficult