This runs much too fast on my machine. (A very quick tap on the "up" key darts me right across to the other edge of the screen...) You should adjust the speed to somewhere closer towards the middle of the speed slider.

In this particular case, the error message is java.lang.IllegalArgumentException: Could not find file: body gibs/Bone1.png So look at the file name "Bone1.png" and pay attention to uppercase/lowercase differences. Also, avoid spaces in folder names and file names (such as "body gibs").

My browser seems to have problems with the image of your 'Basurero' class. It doesn't load, and so the scenario doesn't run. Are you using an unusual image format?

This creates the following error in the Java console when I try to run it: java.security.AccessControlException: access denied (java.io.FilePermission savedata.txt read) It seems that you are trying to access a text file. You cannot do that in this way when running in a web browser.

Not enough for a fly-through, but maybe there are some possible improvements. On my machine (MacOS X 10.5.5 on Intel), the following change helps. Replace: this.image.setColor(colPeriphery); this.image.drawLine(x, y, x, y); with this.image.setColorAt(x, y, colPeriphery); This will be highly dependent on the actual system's graphics subsystem, so I am not sure whether you get similar results on other systems. But on my machine that was faster by a factor of about 3.