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How to Enter the Mystery Room
Puzzles Guide - Undertale Wiki Guide - IGN
The Ruins is the first area and for the first few puzzles, Toriel will walk you through them. Here are the other solutions. Head down and then right into the next area.
Anyone that's started up Undertale for the first time will encounter a mysterious locked door early in the game's Snowdin area. Nothing will open it, not even the expensive Mystery Key item. Learn how to get inside with the quick guide below.