Well, I´m programming a memorama game, when a pair of cards are clicked, the comparison is automatically, and it can´t appreciate both images of cards because they are flipped (when are not equal) or dissapear (if both are equal). So I read the documentation and found Greenfoot.delay(). I tested it and worked the first time (yesterday) both cards stay freeze two seconds before being flipped, but I opened my project today and Greenfoot.delay() don´t worked, and i wondering why stops working?. Or, exists any other way to pause the game or freeze the cards before being flipped? this is how I´m using the method