I hadn't realized that one of the recent vrchat updates broke the mahjong world in a weird way. Udon's SendCustomNetworkEvent with NetworkEventTarget.All used to not run on locally on the sender, but it now calls the method synchronously within the same frame as the SendCustomNetworkEvent call. I had a call in the Start() method that called some methods on other UdonBehaviours, which weren't necessarily initialized (by their own Start() methods). This caused NPEs and general breakage. I fixed it now though, so the JUST riichi mahjong map is back up, give it a try
https://vrchat.com/home/launch?worldId=wrld_c69bade4-f2de-4da1-892a-b499b8798190

Also took the time to finally add some light yaku and scoring guides to make the map more usable for EOPs. The map still still the same weird prototype grid aesthetic, but I'll get to that eventually.