[4. Request Inclusion in the Arena](https://codelabs.developers.google.com/codelabs/rainbowrumpus?hl=en#3)
To join the Rainbow Rumpus you will need to join an arena. Open [rainbowrumpus.dev](https://rainbowrumpus.dev/) click join on an arena where you will provide your microservice URL.
The link from https://codelabs.developers.google.com/codelabs/rainbowrumpus is not reachable.