So I got bored and made up a... kind of complicated but fun sounding BOTW challenge. It's a combination of permadeath and nuzzlocke, I think. More of a realism challenge.
If you die, you're dead. You have to start again from the beginning.
Drowning and falling into the void are considered deaths
Master Sword trial deaths don't count
Mipha's grace can only be used once
Daruk's protection, Revali's gale, and Urbosa's fury can only be used three times
Once you see an ability recharge, you have to deactivate it
If you choose to complete Champions Ballad, you unlock the ability to use the abilities infinitely
You must set your HUD display to pro mode (removes the mini map and other information). You can open the slate to look at the map though
You can only register one horse through your entire playthrough. If it dies, you have to resurrect it
No ancient horse armour or bridal
You can only use the Sheikah Slate to teleport between towers (you have to climb it to use it), and you can use the travel medallion like normal, but otherwise no teleporting
Master cycle zero is allowed
You must save all travellers from monster attacks if you see them
You must have at least one meal a day
Within reason, all food needs to be cooked. You can eat things like apples raw, but meat etc. needs to be cooked
You can't have the same meal two days in a row
No eating during combat. If you move a sensible distance away from the enemy you can refill health, but you can't just go to inventory right in the middle of a fight.
You should try and sleep every night. Fires, inns, stables, and Link's house are all options.
You may continue to travel through the night, but you can't pick anything up or fight any monsters, you just have to run away
The no night restriction can end in two ways: carrying a torch or flame weapon, or wearing special night armour (dark set, radiant set, upgraded sheikah set, tingle set)
Glitches and physics exploits
Nothing helpful is allowed
This includes BTB, wind bomb, moon jump, heart glitch, shield clipping etc. etc.
Flying machines are allowed, plus using magnesis to push things.
With the exception of quest necessity, the following sets of armour can only be worn when you have all three pieces together:
Ancient set; Barbarian set; Climbing set; Dark set; Desert Voe set; Flamebreaker set; Gerudo set; Radiant set; Rubber set; Sheikah set; Snowquil set; Soldier's set; Zora set; Armour of the Wild; Tingle's outfit; Phantom set; Royal Guard set; Salvager set
The Hylian set and Worn set can be mixed and matched with the following items:
Champion's tunic; sand boots; snow boots; thunder helm; warm doublet; all jewellery; single DLC items
Majora's mask (Kilton's masks are still okay though)
You must fully upgrade and customise whatever armour you bring to the Calamity Ganon fight
Weapons, bows, and shields
Generally, once you break a weapon, you can never pick the same type weapon up again
There is no limit to the following items:
Anything rusty; korok leaf; tree branch; wooden mop; pitch fork; farming hoe; fishing harpoon; boat oar; drillshaft; iron sledgehammer; woodcutter's axe; double axe; pot lid; torch; bone arms
If rusty weapons are cleaned by octorocks, you can keep whatever they turn into
Items that are directly dropped by bokoblins, moblins, lizalfos, Yiga clan, or wizzrobes
Items given to you or sold by NPCs
One time exceptions. This means you can pick up any item in these cases, even if you've had it before, but after the blood moon you can't revisit the same location.
Anything used in the master sword trials and Eventide island
Items dropped by guardians in shrines
Special locations (such as hidden caves, mini games)
Each mini boss (including lynels)
You must complete the main quests
You must complete all memories
You must get the master sword
The master sword trials and champion's ballad are optional
The following side quests must be completed:
Hylian Homeowner (Link's house); From the Ground Up (Tarrey town); By firefly's light, flown the coop, find the fairy fountain (to unlock the stolen heirloom); Hunt for the giant horse and The royal white stallion; Find Kheel; The korok trials; The priceless maracas; The statue's bargain; Medical molduga, The secret club's secret, The mystery polluter, Tools of the trade, The search for Barta (to unlock the thunder helm)
All shrines (and shrine quests)
Hateno and Akkala tech labs
Basically any other permanent change task, minus korok seeds
Well, good luck if anyone tries this!