A medium sized knife only map, supports up to 16 players.

The map was intended to be played with the newer graphical engine which you can download here:
http://www.mydevstuff.com/twoseven/q3mods/ut_bumpy_pack.rar

How to install:
Put the "q3ut4" folder, and the "iourbanterror42_bumpy_v7a.exe" you downloaded in your Urban Terror 4.1 folder. The rest are only needed for mapping purposes. You just have to launch the executable and bang, you're done.