Half-Life

     Have you played Half-Life? This game is a blend of a science fiction story and. a horror game, and its topped off with a government cover-up. You are Gordon Freeman, a scientist who shows up late to work one day. And that day is eventful, as you show up to watch a portal open up and bring killer aliens into the deep underground that you are in.

     You are thrust into a first-person adventure where you have to fight your way to the surface, shooting or using your handy crowbar to defeat the vicious aliens and a mysterious military faction along the way. The appeal of this game isn't just the tight combat, but the puzzles you have to solve along the way, including riding conveyor belts and navigating a minefield.

Belongs to Valve

   This game is near perfection, with an interesting plot and fun gameplay. There are a few drawbacks, however. The graphics are a constant reminder of the games age. And there are no cutscenes, with the game relying on in-game dialogue to convey the story. These are negatives, but the positives of the game far outweigh them.

This game can be pretty tricky sometimes, so here is a link to a helpful walkthrough.
http://www.ign.com/wikis/half-life/Walkthrough