Go to hotland and into the lab door slide undyne s letter under and complete the date with alphys.
Undertale door slide.
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Unfortunately undyne didn t sign it so alphys will think this declaration of love is from you and the two of you will go on a date.
Solution to the puzzle after the save point with the doghouse and the puppydog building the snow dog.
Turn on the generator to trigger a conversation with alphys.
Will drop you into another room continue through the door to the right to reappear on the other side of the dark patch in the previous room.
All you can do is slide the letter under the door.
Come join the fun.
Not the only solution but just one that works.
What do i put under the door on the far right of the hotel in undertale i have tried the pancake thing shaped like metatton s face but it didn t work.
Undertale by indie developer toby fox is a video game for pc ps4 vita and switch.
Find the 4 keys scattered through the true lab to open the power room door.