This challenge has only been completed by Lolo26 and a couple others.

NI = No Items: You cannot use any items at any point of the challenge. Exceptions: All the Key Items, Batteries and the Save Crystal.

IE = Initial Equipment: You are not allowed to equip any Weapon or Armor. You can only use the Equipment the characters are equipped with when they join the party.

NA = No Accessories: Accessories are prohibited. No exceptions.

NPA = No Physical Attacks.

NLB = No Limits Breaks: You are not allowed to use any Limits.

NNMI = No Non-Mandatory Inns: You can't rest unless the game forces you to do so.

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Allowed Materia:

Barrier
Destruct
Earth
Fire
Heal
Ice
Lightning
Mystify
Poison
Revive
Restore
Seal
Time
Added Effect
Elemental
Magic Counter
MP Turbo
HP Absorb
Cover
HP Plus
Luck Plus
Magic Plus
Speed Plus
Full Cure
Shield
MP Plus
Transform
Comet
Sense
W Magic
EXP Plus
Gil Plus
Pre-Emptive
Enemy Lure

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Notes:

- Summons are banned from the challenge.
- A few materias aren't accessible, they aren't listed to keep it simple.
- The Enemy Skill materia is banned.
- MP Absorb, Gravity, Quadra Magic and All were all banned because they are too powerful.
- You can't use any materia that might interfere with the rules (Deathblow, Throw, Added Cut, Slah-All etc....).
- Ultima isn't on the list because you can't get it. To get it you have to catch up with the Shinra Train, but by doing this you get healed afterwards (even if you aren't able to stop it in time) so it's considered a Non-Mandatory Heal and isn't allowed.
- In the the Great Glacier you are not allowed to collapse, to avoid the Heal at Holzoff's Shack.
- In the Whirlwind Maze you have to have Tifa in your party before she forces herself into the party or else the party will be healed.

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Mandatory inns:

1. Cloud is healed after you escape Reactor No.1
2. The party is healed in the 7th Heaven Bar
3. Cloud is healed after he falls in the Church
4. The party is healed once Aeris reaches the top floor of the Church
5. The party is healed at Aeris's House
6. Cloud is healed on the way to Wall Market
7. The party is healed as soon as you reach the bottom of the Pillar
8. Cloud is healed after the fight with Reno
9. The party is healed on Floor 67 in the Shinra HQ
10. The party is healed as soon as you have confirmed the death of President Shinra on Floor 70
11. The party is healed before the motorcycle game starts.
12. The party is healed as soon as you reach the World Map
13. The party is healed after the Flashback in Kalm
14. The party is healed in Junon after defeating Bottomswell
15. Cloud is healed as soon as you enter Gold Saucer
16. Barret is healed when he fights Dyne
17. The party is healed after you defeat Gi Nattack
18. The party is healed in Gold Saucer, just before heading to the Temple of the Ancients
19. The party is healed in Gongoga, after the Temple of the Ancients
20. The party is healed when you have dug for the "Lunar Harp"
21. The party is healed in the Forgotten City
22. The party is healed once you get to control Barret at the Execution
23. The party is healed once you re-enter Midgar
24. The party is healed after Hojo, at the end of Disc2.