portal tips

Ok if you get the Orange Box portal is probably the best game in it.

Tip 1 you cant fire one portal through another one.
Tip 2 If you fall off the height of a cliff through one portal you go fast through the next.
Tip 3 the cake is a lie.
Tip 4 you kill the robots by tipping them over
Tip 5 in any lvl with robots in it watch where you shoot your portals.
Tip 6 use the rocket launcher robots to blast out glass and nock stuff down.