Bud Interactive, calculus rooms (version 0.0.1/preview), SwuduSusuwu2002Newer version: https://video.fc2.com/content/20241223KEV5T3QZ
No affiliations to Bud Interactive.
https://share.budcreate.xyz/78993e (Calculus Lesson 0.1.1, has 6 equations, door passwords = solutions)
Allow upload/download: Creative Commons attribution.
Swudu Susuwu = age 26 fox, born from Amaterasu (plus unknown, Susanoo?)
Sounds: Bud-Dungeons.