Very deep rumbling and thumping – makes the place seem HUGE! I also love the sound effect in that room.

It’s clear that Valve wanted the play to know that saving character could bring rewards. This level also see the introduction of the first ceiling turret, shown via a simple scientist running into its firing path – silly man! Plenty of crate-breaking and backtracking in this section, along with the first real vent crawling section. Of course, I did and I just survived but not on the way back. Walking along the wall near the vent you also get an electrical surge designed to stop you trying to progress that way. The same goes for the two doors on the right, through these you can see two scientists running away and one getting caught by a

The headcrabs are electrocuted, giving clear warning to the player, “Don’t go this way!” If you don’t rush out of the elevator nothing happens, but as soon as you do, the scientist gets dragged up through the ceiling and the headcrabs come walking towards you.

The Replay Experience Experiment aka TREE.

Office complex half life