Just finished playing through HL1 and HL2 again.. as I do every 3-5 years. Maybe it's all nostalgia at this point but I just love being in that universe. The familiar sounds of a crowbar on metal, a sliding door etc. I was never very good at the relentless keyboard gymnastics required for other FPSs so I fell in love with this game that had puzzles and varied pacing and felt like a movie.