@trimil, I was wondering why your high score matched mine as well as why all my games ended up with that score. Evidently, I was not counting the clicks :/

@trimil, if I added some type of scoring system, I would have to limit the scoring to a specific number of levels (not that that would be a problem). Maybe I will add one. I was thinking to allow the last level (with 16 cards) to be included three times to make a total of ten levels. I do not think I will do a high scores comparison among different users; but, I was thinking of allow a user to reset and try to better their current high score for the current session. What were you thinking? or what do you think about my plans?

@JetLennit, probably the newer version of Java and its more strict security measures. So sorry to yours and everyone else. What was your vote to be? Maybe everyone should just state how they feel about the issue openly here in the comments of the scenario.

When I click on the Start button (from my desktop) and select 'Control Panel', I get an icon for 'Java (32-bit) which can be clicked to open the Java Control Panel.

@Singunner, go to your control panel and click on the java icon (it might say 'Java (32-bit)'). Then go to the miscellaneous tab and make sure the Exceptions Site list includes the following entry: http://www.greenfoot.org/

@Singunner, I am sure that your issue is not unique to this scenario. You are most probably getting the same message on all scenarios you try to access. There may also be a java setting that needs to be tweaked (java control panel).

In the Mover class, in methods 'canMoveRight' and others, where you get a list of each type of barrier, you do not need to ask if the list is null as there will always be a list returned -- it might be an empty list, but it is a list just the same. I will not ask, but suggest that you just set 'vSpeed' to zero in the 'onGround' method of the Mover class. Then you will not need to ask the programmer to add the code at the end of the act method.