Here is another entry for the 4K. It is called Tank War.
http://www.javaunlimited.net/games/launch.php?type=jnlp&id=146
Navigate the maze with your tank. Avoid colliding with other tanks while trying to destroy them.
Controls:
Use arrows or WASD to move in the desired direciton.
SPACE or CONTROL to fire.
SHIFT to drop a mine.
NOTE: Your mines do not hurt you.
I have a lot of space left, so all suggestions are appreciated. Also let me know if it is too hard or too easy.
Thanks.