Hi, does anyone know how can I make chat that will be global, like in My Hello Kitty Cafe?
It’s definetly possible using the MessagingService which allows you to post and read data between servers. You would have to make a topic referencing your global chat and an interface where users can post their messages as data to that topic. Finally you would have to make a receiver who will pickup those messages and visualize them in some form. But you need to keep in mind that the MessagingService also has limits, so when having a lot of users posting many messages in such small timeframes they could reach those limits. This would probaly cause your global chat to slow down, so I would recommend adding a cooldown before a user can post a message again to help prevent this.
Documentation: MessagingService | Documentation - Roblox Creator Hub