Every iteration of the level is documented in the Iteration Log, providing additional detail on the changes, screenshots of the altered areas, and more in-depth thoughts and explanations on why I chose to make these changes.
In total, Plateau of Leng went through 7 different versions, from first blockout and first whitebox, determining scale and layout, to fifth and final iteration, focusing on smaller details, rough edges, etc.
Together with the playtesting log, these documents provide a comprehensive overview of the playtesting/iteration process.