* Never use the pulse grenades in closed compartments or near essential 
  pickups (pickups are destructible). If you are surrounded or trapped, 
  use the burst fire.

* Ignore all the Weyland-Yutani canisters strewn all over the level. 
  None of these contain anything of value.

* Ignore searching for loot inside crates. There are no destructible crates.

* Steam does not hurt. Smoking does...

* Do not try to open doors that are locked. There is no way you can open these.