aim your gun using mouse or touchpad. press space to shoot Survive underwater in xen for as long as possible. You will fight leeches, ichthyosaurs, and tentacles. After you have survived for 40 seconds, the tentacle boss fight will start. Shoot its tentacles and once its tentacles are dead, shoot its head. Survive for as long as possible. It is too dangerous to go into the water without great protection, so you must stay in the shark cage and shall not leave under any circumstances.
Valve for half life and almost all of the assets. Just so you know this game is pretty hard so... also credit to sketchfab for the shark cage.
