How many monsters die in the Undertale genocide run?
You gotta take down about 20 monsters in the Ruins, 16 in Snowdin, 18 in Waterfall, and 40 in Hotland/CORE - plus a handful of bosses. Total's roughly 100.
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In the genocide run of Undertale, you need to kill a specific number of monsters in each area before you can fight the bosses. The total count is around 101 monsters, but it can vary slightly depending on how many random encounters you trigger.
I've personally done the genocide run, and the killing spree adds up to about 101 monsters. The game really makes you work for it!
Right around 101. Yup, it's a lot.
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