"To be game" is informal and means "to be prepared or willing for smth". For example: I'm game for a try. Is anybody game for some beer? She's game for anything.

she is willing and ready

i'm game= estoy dispuest@ a..

It's slang for someone expressing interest. She is game = she is interested. Is anybody game for some beer = is anybody interested in some beer.

sorry, it is What DOES this mean