There are separate Halls of Fame for the Standard and the Expert version of each WordSearch. (There is a separate Hall of Fame for each WordSearch Puzzle as well.)
Each time you play a particular WordSearch, the location of the words in the grid will obviously be different. In addition, however, the actual set of words used may be different from one run to the next!
It may therefore be a good idea to practice with the Standard version of a WordSearch for a while before you attempt the Expert version, so that you may become acquainted with the full set of words available for that WordSearch.
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