IW v2 is a overhauled version of the original IW. It holds little in common with the original as the 3 episodes that featured in it have been heavily updated. Plenty of new weapons have been added and there are 2 new episodes as well. One of these consists of maps made by the Duke Nukem community for both IW v1 and V2. The other episode is a much more story orientated episode with time travel and even has a choice of endings. Iw v2 uses Eduke32, an Enhanced version of JfDuke with much more coding control allowing fantastic effects. The port it is based on allows for models and high res textures which IW v2 takes full advantage of.
What's new in V2.1: -Art files integrated into main Duke3d.grp to enable mod support -Fixed some Government Trooper art issues and enabled injured AI -Alternate map set without skybox support for people with skybox crashes -Added Magnum to some more earlier levels Once zipped into your IWv2 directory, either delete all of the *.art files in the directory or run the included bat file. If you've had trouble with the dynamic skyboxes in IWv2, included is a folder called 'No-skybox' - Simply copy it's contents into the main IW folder (make a backup of the existing map files if you wish) and overwrite when asked. This will remove the skyboxes from those maps and go back to the standard Environment maps that the other levels use. Also included is an updated Eduke32 snapshot - load times and performance are worse for myself, however your mileage may vary. If you have trouble with the included Eduke32.exe than try using the Eduke32_Alt.exe instead.