Feel free to join as a beta tester.
You will see new contents, features, and game mechanics before they become public.
If you want to join as a beta tester, please follow this guide:
1. Go into CastleExplorer steam game properties.
2. Click on Beta tab and opt in.
There is no password.
Note, you can always undo this action and resume the stable CastleExplorer branch.
Disclaimer: The Beta branch is an unreleased version of the game that may contain bugs, crashes, etc. We do not advise you to play on it unless you are aware of this and it doesn't bother you.