Talk:Real Escape, Fourth Play Princess/@comment-29735774-20191111211004/@comment-29727671-20191111233851

At first I thought it's ARG, but someone on twitter posted hint to this:

https://ja.wikipedia.org/wiki/脱出ゲーム#リアル型脱出ゲーム

Real Escape Game, where people gather clues and solve puzzles trying to escape from a room. ("riada" most likely comes from the site realdgame.jp)