Super Thundershot

Yes, it's to do with the security manager and the GreenfootImage class. I am using reflection to change the BufferedImage used internally by the GreenfootImage. As standard GreenfootImages have full alpha support and I was replacing the BufferedImages with one that only had partial or no alpha support, as these were far faster. I had originally presumed that the security exception wasn't being caught by my code. My original solution was to catch it and so not have the images changed. It would be a lot slower if your not logged in, but would work. However it appears my code is catching it, so I'm still unsure why it fully breaks. I do however have a new fix which I might try implementing today (and actually do it too). I still plan to finish Super Thundershot but after I have finished my current game, Sokoban Supreme (comming soon).

The angle is found through triginomety. You can create a triangle from the shooter to the mouse cursor. One side is the difference between both points on the x-axis, another side is the difference along the y-axis. These allows you to find the angle from the shooter to the mouse cursor. This is the code: double angle = Math.atan2(mouseY-getY(), mouseX-getX()); setRotation((int)Math.toDegrees(angle)); I also have my own class that wraps around the Mouse interface to offer an interface which I much prefer (and performs some internal error check for me). I also use the angle for setting the angle of the shot it creates.

You might want to consider changing the background to something less sporatic and consuming. I found it distracting and degrading on the speed. Constructive Criticism aside: This is a fantastic game, with good effects, playability, and Fun!