How does Undertale know I killed Toriel?
Undertale tracks your actions through saved game data, so when you kill Toriel, it saves that information and brings it up later!
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It's all in the game's save files! Undertale is sneaky and remembers things like a grudge-holding AI.
Because Undertale never forgets. It's like it has a little monster diary for your every action.
Undertale keeps track of your choices using its save and metadata. So, your decisions, like killing Toriel, aren't forgotten.
The game saves your choice, simple as that. No magic!
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