[PC, Steam] Free: Half-Life (U.P. $10) @ Steam

I used to play this all the time. Was $10, now free to keep forever but claim by Tuesday.

Named Game of the Year by over 50 publications, Valve's debut 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…

via dealbot at OzBargain