This data is provided without limitations for NON-COMMERCIAL use, except
1) In publications making of use of this data, please cite:
D. Vickrey, A. Bronzan, W. Choi, A. Kumar, J. Turner-Maier, A. Wang, and D. Koller. Online Word Games for Semantic Data Collection. EMNLP 2008.
2) If this data is used as part of a web application, please mention the source of the data and provide a link to the word games at http://wordgame.stanford.edu

The current data release does not contain any auxilliary data beyond the actual guesses collected.  
Note that guesses are not aggregated; words that have been guessed multiple times for a particular category are repeated.  
If you are interested in some aspect of the data beyond the category/answer pairs, please email dvickrey@cs.stanford.edu with your request.

Directory contents:
categorilla_categodzilla_releasedata: All collected category/answer pairs as of releasedate for BOTH Categorilla and Categodzilla (please refer to "Online Word Games for Semantic Data Collection" for details); the current release does not identify which game it came from
free_assocation_releasedate: All collected seed word/answer pairs as of releasedate for Free Association