Half-Life (1) was the game that got me into FPS in general and kept me away from the horrors that is CoD or so.
Half-Life 2 probably has the best campaign though. Especially considering all achievements for example.
Worst is difficult – I like them all for what they are, but the one I like least is Half-Life 2 Episode 1.
Does Valheim have nerd dragons? :D
Ngl would suddenly be interested.