Half-Life was my introduction to FPS gaming; I loved every game in the series that I had the pleasure to play - Half-Life, Opposing Force, Blue Shift and Half-Life 2 (Lost Coast, Episode One, Episode 2). I never got round to playing Alyx; I didn’t have hardware that would cope!
Half-Life also spawned the CounterStrike series; I sank way to many hours into them.
My favourite game remains the original; I enjoyed the narrative and the occasional puzzle. I purchased the upgraded graphics pack (which also fixed a few glitches) and prefer the original with this pack to the remastered version of the game (Half-Life: Source).