I have a question about the PlayerInfo:
Is that feature available for everyone who visits this site, or just for those who registered themselves on greenfoot.org?
thank you
Available?
If you mean: will your scores be registered on scenarios that use it, then, yes, as long as you are logged in.
If you mean: can you program scenarios using it, then, as long as you are using Greenfoot 2.2.0 or later, yes.
NOTE: it was called 'PlayerInfo' in the beta version of 2.2.0, only. It is now referred to as 'UserInfo'.