With this flag on, go up to any NPC and hit Y to remove them from the map. Any screen transition will reset any “removed” NPCs, but you can remove them again.

NPCs are not limited to just townspeople. You can remove monster NPCs, various random objects, locked doors, and even invisible barriers.

Note that any removal of boss NPCs that result in skipping the fights entirely will also bypass any rewards resulting from that fight event. It is possible in some cases to soft lock a seed if you have skipped these fights but are required to acquire certain Espers, kill certain bosses, or complete a certain number of checks.

Y NPC provides access to:

• All of Magitek Factory: remove the NPCs blocking the entrance when gated by Celes. You can then remove the Ifrit & Shiva and Number 024 NPCs as well, skipping those boss fights entirely.
• All of Zozo, in both worlds, including Mt. Zozo and its reward. For Mt. Zozo, remove the NPC door that you normally need to buy Rust-Rid to open. For Zozo Tower, remove the Dadaluma NPC blocking the last stairwell to skip that fight. In Zozo WoR, remove the sleeping NPC blocking the doorway to enter Zozo Tower. Note that in character gating mode, there will be no reward at the top of Zozo Tower if you haven't recruited Terra.
• Figaro Castle Throne and Engine Room in the WoR, and subsequently Ancient Castle. Remove the NPC in South Figaro Cave WoR that blocks access to the tunnel leading to Figaro Castle. This NPC normally disappears after you have recruited Edgar. While in Figaro Castle, you can remove the blocked main door to go north to the beds, shops, and throne, even while the castle is buried - that is, before you have completed the Engine Room check.
• Narshe WoR: remove the locked doors leading to the Weapon Shop and Cursed Shld. Other locked doors in Narshe can also be removed - notably the treasure hut.
• Floating Continent: remove the AtmaWeapon and Nerapa NPCs to get the final reward without fighting either boss spots.
• Albrook dock in WoB: remove the Magitek NPC blocking the way to get access to the dock chest in WoB
• Imperial Camp: remove the “NPC” when facing the hit/kick/leave chest, which allows you to open the chest without any cutscene.
• Opera House WoB: remove the locked left side door which leads to the catwalks; no need to flip the right side switch.

Potential soft locks or other traps:

• Imperial Camp: remove the Kefka NPC during the chase sequence, or remove the check reward NPC during the 3 battle sequence.
• Collapsing House: remove the kid NPC. You can also remove the NPC that normally blocks the way into the collapsing house, even if you don't have Sabin. However, this will start the timer. The kid NPC won't be in the house if the Tzen sequence outside didn't happen, so you will need to either start another timer (e.g. Opera House) or find another way to get rid of the timer, otherwise you will gameover.
• phantom train (removing the ghost that blocks the door)
• getting airship stuck on island after leaving on the raft/Cid cutscene
• mtek (removing Cid before the mine cart ride, removing the ifrit & shiva/number 024 npc's and completing the cart ride, entering the mtek factory after completing the Cranes fight and attempting to leave Vector normally)
• doma siege (removing the boss)
• floating continent (removing the first check reward at the beginning, removing the atmaweapon npc and completing the exit sequence)
• figaro castle (exit while the castle is in transit to/from kohlingen after finishing the tentacles check - you'll appear on the world map but the castle will still be buried)

Other notes:

• opera - delete ultros on the catwalks. You'll have to exit the catwalk screen to reset - go back to the left hand stairwell and then back to the catwalks
• owzer's mansion cycling doors can be removed
• collapsing house WoR - if timers are on, the timer will be started as soon as you enter the doorway. you can only reset this timer by completing the check or starting another timer (e.g. begin the Opera check)
• hidon NPC is delete-able. going on the teleporter will reset this
• flowers/letter in mt zozo