The summary could be:
The user is playing Undertale and exploring some of the secrets and hidden content in the game. They encounter two secret bosses, So Sorry and Glide, and manage to defeat them after some attempts. They also discover some secrets related to Sans, such as his code words, his room, his machine and his possible time-traveling abilities. They also interact with some other characters and items, such as Onion-san, Suzy, the legendary artifact, the dog residue and the piano puzzle. They end the episode by saying that they will start the genocide run next time.
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