All missables in Undertale
Everything you can permanently miss, in the order you reach it: where it is, how to get it and what locks it out.
| Item | Area | Where and how | What locks it out | |
|---|---|---|---|---|
| Monster Candy | The Ruins | Taken from a pedestal in a room early in the Ruins (up to 4 times) | Being checked | |
| Spider Donut | The Ruins | Purchased from the Spider Bake SaleExact spot: being checked | Being checked | |
| Spider Cider | The Ruins | Purchased from the Spider Bake SaleExact spot: being checked | Being checked | |
| Toy Knife | The Ruins | Found on the left side of the balcony overlooking Home, near Toriel's house | Being checked | |
| Faded Ribbon | The Ruins | Found behind a puzzle switch inside a room with multiple holes in the floor | Being checked | |
| Old Tutu | Waterfall | Hidden behind the waterfall in the room with falling rocks | Being checked | |
| Ballet Shoes | Waterfall | Hidden in the tall grass in the room with glowing Echo Flowers and winding pathsExact spot: being checked | Being checked | |
| Abandoned Quiche | Waterfall | Hidden under a bench on a secret screen found by placing bridge flowers in the bottom-right corner of the puzzle room | Being checked | |
| Abandoned Quiche | Waterfall (Quiet Area) | Found hidden in the secret room accessed by riding a flower bridge off-screen to the right in the bell puzzle area | Being checked | |
| Dog Residue | Waterfall (Quiet Area) | Acquired in the artifact room after playing the correct melody on the piano, taken by the Annoying DogExact spot: being checked | Being checked | |
| Temmie Armor | Waterfall (Temmie Village) | Tem Shop, unlocked after funding Temmie's college education for 1000GExact spot: being checked | Genocide route | |
| Stained Apron | Hotland | On the lower ledge of Hotland Floor 2F, past a puzzle involving conveyor belts and steam vents | Being checked | |
| Burnt Pan | Hotland | In Hotland Floor 1F, accessed via a vent puzzle on the south path | Being checked | |
| Cup of Water | Hotland | Taken from the water cooler outside Alphys's LabExact spot: being checked | Being checked | |
| Heart Locket | New Home | Toriel's home, inside the gift box in the right bedroom (Pacifist/Neutral routes) | Being checked | |
| Worn Dagger | New Home | Toriel's home, inside the gift box in the left bedroom (Pacifist/Neutral routes) | Being checked | |
| The Locket | New Home | Toriel's home, inside the gift box in the right bedroom (Genocide route) | Being checked | |
| Real Knife | New Home | Toriel's home, inside the gift box in the left bedroom (Genocide route) | Being checked | |
| Undyne's Letter | Waterfall (Post-Neutral) | Given directly by Undyne outside Papyrus's house in Snowdin, but requires delivering it to Alphys in Hotland while passing through WaterfallExact spot: being checked | Being checked | |
| Undyne's Letter | Hotland (Post-Neutral) | Given by Undyne outside Papyrus's house in Snowdin to be delivered to Alphys at the Lab in HotlandExact spot: being checked | Being checked | |
| Undyne's Letter EX | Hotland (Post-Neutral) | Replaces Undyne's Letter if the original is destroyed or discardedExact spot: being checked | Being checked | |
| Last Dream | The Void | Generated directly into the inventory during battle using the "Dream" ACT commandExact spot: being checkedHow: Use the "Dream" ACT command during battle | Being checked |
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