There is a tenth level in Shrapnel City called Tier Drops. To get there, go to 
the movie level, and go to the stage with the NASA sign and the body parts with 
a telescope. Kill the alien with the chain gun, and press [Use] on the sign. A 
door should appear with the caution sign that ends the level. Note: Do not go to 
the stage with the ship or this will not work.