Undertale Yellow has some amazing secrets. Here is a video documenting a few of the ones I've found!
...And yes, *that* secret is in this video. Croak.
~~~
GAME - https://gamejolt.com/games/UndertaleYellow/136925
Please play it.
Music -
Undertale Yellow OST by MasterSwordRemix
Based on: Undertale & Deltarune OST by Toby Fox / Materia Collective
TWITTER - https://twitter.com/Shayy_TV
TWITCH - https://www.twitch.tv/shayy
DISCORD - https://discord.gg/shay