Talk:W. D. Gaster/@comment-38660390-20190624222516/@comment-35336328-20190627034259

No, do this.

Go to Final Corridor, save before going to sans, after his dialogue ends, exit the game, go back, and keep listening to the dialogue until sans gives you his secret codeword. DO NOT SAVE after sans's dialogue. keep doing this a couple times until sans gives you the key to his room. Then, get the key from his cabinet, and go next to the house, go behind it, and voila. the lab is unlocked. Well, the tricky part is going behind the house, and finding the door. Click Z until it says you unlocked the door.