A prototype/preview build (labeled "Preview Code") of Overlord II for the Xbox 360, from 2009-03-29 (about two months before the NTSC release build).
This prototype includes 17 maps, vs. 30 in the final version of the game.
Attempting to play through the game in order will result in a crash after completing the tutorial (most likely due to one or more files that were not included in the preview).
There are files in the PREVIEWSCRIPTS folder which imply that it should be possible to skip to other areas by pressing A, B, X, Y, or down on the D-pad, but the specific technique necessary to do so is not known at the time of this release.