Are you registered user on it ?
Don't hesitate anymore.
You can play now.
Please enjoy yourself.
1. Single play
You can play with AI.
There is no penalty about lose.
Don't be afraid.
2. Watch mode
You can watch other user's game.
3. True social play
You can play with your true friend.
But teamwork is more important than single play.
You can add friend, ignore, chat and so on.