As far as we know, the authentication issues with Steam that prevented players from logging in over the last day or two have been resolved. If not, please let us know.
Be aware that you can set a password for your account through the in game menu options (click the three bars at the top right of the screen and then select "options"). If you have set a password, you'll then be able to use this to login via our web client at http://game.cardhunter.com.
If you have trouble setting a password or need any other help, please email [email protected].