The last way to join a specific Roblox game is if players have friends playing in that server. They are able to join any friend's game if they have the "Join In-game" setting enabled.

With Roblox available on many formats, here's everything you need to know about the game, including tips on how to play safely online.

The full error message reads: Unable to Join. The Roblox game you are trying to join is currently not available. Error Code: 103.