Version 1.21 of Jazz Jackrabbit 2 added a new CTF map called Chemical Warfare to the game. This map was included twice, once as part of the shareware CTF levels and once as part of the full game CTF levels. Unfortunately, if you owned version 1.20 of the game and would patch the game to version 1.23, you would still be missing out, since for some reason the patch does not include the new map.