well, here's the first challenge mode that I know of
that used Chaled.exe by Brian Hearn. A few things..

1) I don't believe this will work on worms united.

2) team 17 cannot offer support for this program as they did not make it
   all support should be directed to Worm GOD or myself[currierd@iinet.net.au]

3) to run this you'll need chlbuild in the chaled.zip at:
   http://www.iinet.net.au/~currierd/KilJaeden.html

4) enjoy... and look for more that will be available in the future as well as
   the codes for this challenge mode at the URL above.