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Half-Life 2 is currently 100% off for its 20th anniversary, plus a major update
(store.steampowered.com)
Bonus: it also seems that the episodes have been rolled into the base game. Full details of the anniversary update.
In terms of storyline, it doesn’t really matter too much.
I still think you should play through the first one. If you need something that feels less 1998, Black Mesa is a remake of the original Half Life and it is very fun.
FYI, Black Mesa is currently on sale for $4.99, absolute steal at that price.
Maybe it's because I played them too late, but while I mostly had a blast playing HL2, the first one never clicked for me.
I know, it's been very influential and new when it released, but it was still quite straight a FPS game. Whereas HL2 is like a crazy theme park of different ambiences and mechanics.
Playing the original Half-Life is like a formative gaming memory for me... It had been such a massive leap from your DOOM 2s and Dukes Nukem. I was super young though, so I don't know how much I cared about the narrative.
HL2, on the other hand...Now that I remember vividly. I remember having to use five CDs to install it because Steam had literally just been invented (for HL2). Having to create a Steam account and log into a service to play a game was so foreign at the time lol...
Might be time to re-play.