- POSSIBLE SPOILERS -
Because this is a secret mode, Toriel is considerably harder to go through and, in fact, outright kill you regardless if you take too many hits. Took me only a total of one death to get both a mercy and kill run in, but half of her patterns really screw me over. If you're playing the game normally, you can simply mercy your way through because she'll stop attacking you directly if your HP gets really low. That doesn't apply here.
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