Named Game of the Year by over 50 publications, Valve's début title blends action and adventure with award-winning technology to create a frighteningly realistic world where players must think to survive. Also includes an exciting multiplayer mode that allows you to play against friends and enemies around the world.
It’s 2137. There is a War between Earth and the Mars Colonie. You're Gordon Freeman, A special military-scientific unit of the Earth force. You are in a Mars Prison ship with some earth science personnel and some earth police. During travel in the prison ship to Mars the ship is attacked by an yet unknown alien race. This gives you the chance to escape…... 3 maps of varying quality, play and comment.
About the room being flooded: you're supposed to press the button and then leave before the door will be blocked.