This game is really, really well done. I like the way it makes you think. Recently, I showed it to my son. He's young (just turned nine), but he's pretty sharp. I set him up with an alternate Card Hunter account--using the same Steam account as for my main Card Hunter account. He's past the tutorial and doing quite well. I thought it would be no problem for me to log in on the wife's laptop and play multiplayer with him, but since he's built his characters up using my Steam account, I can't play my other Card Hunter account (that's linked to the same Steam account) on the wife's laptop without logging him out of his game. Is there a way around this so I can use one of my characters (with access to my cards) in a multiplayer game with him?
Create password for your account via options and log in with browser: http://game.cardhunter.com/ That way you can even play the campaign in co-op mode.
Have you tried logging one of the accounts in through the website? You'll have to set a password first through the Steam client.