Classic Doom speedrunner and as of 2023.08.13 current keeper of the world record for Doom's episode 2: The Shores of Hell, in the category Any% for the Unity source port 🏴󠁧󠁢󠁥󠁮󠁧󠁿 Teedre ( and you can also find his name in the Quake III Arena leaderboard for the category I can win on speedrun.com: www.speedrun.com/quake_3_arena ) made a commentated walkthrough of the main Quake 3 campaign on the Hardcore difficulty.

Although I haven't seen the entire playthrough yet, based on the snippets I've seen so far, I'd say
this is definitely worth taking the time to watch: www.youtube.com/playlist
Edited 15.55 days after the original posting.