New Nintendo Patent reveals that former Splatoon directors are in charge of the Playtest game

https://www.freepatentsonline.com/20250083046.pdf The patent lists Yusuke Amano, Tsubasa Sakaguchi, Masaki Wada and Shinya Yano as the inventors. The first two directed the first Splatoon but Sakaguchi went to work on Labor. The latter two were programmers on Ring Fit Adventure.

The patent is about sandbox building akin to Minecraft and Roblox, specifically the process of setting an area to restrict player actions i.e. to prevent other players from griefing your building. The Playtest game is basically the only game Nintendo has that would have something like this.