I got my first real introduction to first person shooters with Quake II. I used keyboard only, with page up/down keys for vertical look. When Half-Life came out my friend would only let me play if I looked with the mouse instead. I thought that was so dumb. Why not just use both sides of the keyboard? Why split controls across two devices? But I relented and picked up this wonky control scheme pretty quickly. Then I bought my own copy and wore it down to the nubs over the course of years. I loved mods. My favorite was Action Half-Life. I played Counterstrike a few times when Xena Warrior Princess posters were plastered around maps and scientists acted as hostages. I thought it was too derivative of other accurate combat mods.

When Half-Life 2 came out I bought the pricier version which came with HL1 and all the expansions, mods, etc on Steam. Those are my oldest purchases on the service, naturally.