SNAKE PLISKIN - ESCAPE FROM BLACK MESA

First, he escaped New York. 
Then, he escaped L.A. 
Now, he must survive Black Mesa. 

Snake Pliskin has been hired by a private organization
to find Gordon Freemen. But, there is just one catch.
Beside having to contend with aliens, Snake has also 
been injected with another deadly virus. He has been 
given a few days to live until he dies if he doesn't
get the antidote. 

It is a race against time as Snake tries to find 
Gordon Freemen and Escape from Black Mesa.