It's a version of the game ran on a different server separate from the live server. We use it to test upcoming updates to the game without disrupting live game-play. If you can login, it's open for testing, however a lot of people don't use it. If you can't login, it's either set to staff-only, or it's not up running at all.
I'm the Admin for BlankMediaGames however I am not an employee and cannotreset your password or change your email. Please email the Developers below to open a ticket and have them assist you; support@blankmediagames.zendesk.com
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You can access it here: https://www.blankmediagames.com/TownOfS ... TestRealm/ Just an addition to a possible reason why one cannot connect to it would be that the account has not yet been synced to the PTR. Your account appears to be fairly new, so I am afraid you cannot login despite its open.
Disclaimer: I try to abide by the game's softfilter and use the appropriate replacements, when I am using the forums. Those will be set in brackets. Example: [tarnation] Visit my role suggestions and give me feedback: http://www.blankmediagames.com/phpbb/viewtopic.php?f=27&t=28949
Visit the Testing Grounds Occupation: A developers pain and joy (QA-fox), currently "hired" by Ralozey