This game is by one of my students, Nick Rehberg. For a miniature final project, I gave students the option of creating their own assignment. Nick was one of two that did. He made this game. I liked the result, so I've modified the code slightly and put it online.
Use the w, a, s, and d keys to move the blue catcher. Catch as many green squares as you can before the red squares kill you.
Would you like to see the source code or download the program? You can get the files you need here. If you can't see the whole applet, you can press F11 for fullscreen mode or change your screen's resolution.
UW Madison >> CS department >> Tim's website >> Catcher Game