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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.
Imo the best enjoyment to time ratio is:
Black Mesa (the Xen level at the end was redone and extended compared to in HL1 and it's cool but if it starts to drag just move on)
HL2 (main game)
HL2: EP1 start it but maybe skip and watch a playthrough if you get bored
HL2: EP2
HL Alyx, if you can play it on a decent headset. DO NOT MOD IT TO PLAY IT WITH MOUSE/KB it will be extremely boring since it's designed for VR
Have fun, there's simply nothing else like Half-Life games
This is the way.
I disagree. Black Mesa is Black Mesa. It is no Half Life 1. The atmosphere in one is completely lost with Black Mesa. Start with Half Life and play to Alyx. Go back to Mesa for a second way to view 1.