**NOTE:** You can set Environment Variable within balenaCloud. On the left, simply click on “Device Variables” and then click the “Add Variable” button. Give it a name, and set the value.
**NOTE:** You can also delete everything on the server and automatically reinstall it. On the left, simply click on “Actions” and then click the “Purge Data” button. Insert `1` and click “Purge Data”.
Purpur is automatically installed the first time you run it. If you want to change it, you can set the environment variable `MC_SERVER`. (See the configuration section for more details.) Remember to reinstall the server afterwards (set `FORCE_REINSTALL` environment variable to `1`).
**NOTE:** Please note that `pufferfish` versions can only take integer values, i.e.: `1.19`, `1.20` can be specified; `1.20.4` cannot be specified, the game will not start. If you specify version `1.20`, you will be able to play with `1.20.4`.