I'm thinking of starting a new HFW challenge run. Speedruns are fun to watch but I'm not a fan of doing them--I don't enjoy the time pressure, and I don't like having to skip quests and entire chunks of the game. Trying to leisurely 100% the game with some imposed restriction that compels me to try new things is more my jam.
In the past I've tried to do a 100% Green Run: completing 100% of the game on NG Ultra Hard with only green weapons, armor, coils, tools, etc. I came SOO close but I got stuck at the Sheerside Hunting Grounds because the Plasma Trial requires a plasma weapon, and the lowest level plasma weapon is blue. And I still haven't figured out how to beat the trial on UH with the crappy blue plasma weapon. (If you have, get in contact with me please.)
In my most recent run, I tried to do a Headshots Only Run, where every human kill I make has to be done by headshot. I didn't succeed (just one killing shot landing outside of the headshot hitbox technically ends the run) but it was fun and I've definitely increased my headshot count.
I've also done a No Merchant Run, where I buy nothing and sell nothing. So the only weapons, armor, and gear I can use is whatever the game gives as a reward or as loot. (The game surprisingly provides a lot!)
So I'm thinking my next run will be a Low Health Run, which would be playing in Low Health mode (25% health). Because even though you have to listen to Aloy mutter about how she's hanging on for dear life every 5 seconds, the buffs to damage and health are huge. And with the limited armor/weaves/skill tree and tiny health bar in early New Game, this should pose an interesting challenge.
Or maybe a Feral Close Combat Only Run, where only warrior bows and melee attacks are allowed. But I'm not sure if I should include silent strike or other stealth attacks as "feral" attacks.
Anyways, I'm curious what kind of challenge runs other people have enjoyed (either watching or doing). I've heard of No Tools Runs (can't use anything from the tool hotbar menu), No Healing Runs, No Damage Runs, Permadeath Runs, Kill-Everything-That-Sees-You Runs, Spear Only Runs. The funniest I've seen so far is a Rocks Only Run specifically for killing Specter Prime XD And I'm intrigued at the prospect of doing a No Maps Run.