If you haven't played Half-Life yet, this is the way to do it.

Grab a buddy and experience one of the greatest co-op action games ever.

Beautiful spritework and loads of fun are abound in Metal Slug. Play it!

A much slower Fallout game, it still has its own traits that make a playthrough worthwhile.

It's Half-Life. 'Nuff said.

It suffers from some poor in-game menus, but I'd be hard-pressed not to say Terraria is one of the most fun games on PC ever.

What is there to say that hasn't been said? It's freaking DOOM. Why aren't you playing it?

An active community and a plethora of weapons and collectables, CS:GO has something for everybody. Try it if you haven't already.

My personal favorite shooter ever, Half-Life 2 improves on the original by leaps and bounds. If you haven't played Half-Life 2 yet, you're missing out.

it's free and good 10/10