Hello.

I have discovered by chance some codes that can be written in the Chat box to enable certain features in the game, such as: /ignore username.
Are there other code can be used?

Hi.
There is also a code for sending private messages to other Playroom users. To do that, just type in the chat box:
@username your private message

We know that, they are not secret. Aminiel already toled us in a news post. I don't want to sound harsh, but just let you know they are not secret.

None of these commands are secret. I'm just thired of repeating them hundreds of time and I have better things to do, so please do make a search, or learn how to do a web search if you don't know, I think you will find them quite easily.