The only way to do it is to load your Undertale Safe Files on an external harddrive and edit the Files on your Pc! Open up undertale.ini with Notepad. I saw that you can change your fun value, So I’ll need to access the game files but I’m not sure how. How can I change the fun value of Undertale? 🙂 Note: This is ONLY to be used to report spam, advertising, and problematic (harassment, fighting, or rude) posts. The EASY way for me is to go to your Steam library, right click Undertale, click properties, click on the Local Files tab, then Browse Files. Where can I find the game files for Undertale? They immediately disappear once they mention that they are holding a piece of him, playing the same sound effect while disappearing that plays when the NPC assumed to be Gaster disappears in Room 268. Gaster, suddenly vanished without a trace and was shattered across time and space.