I would like to use this activity to teach ancient greek. But some games don't work with the greek letters : Hangman, Cryptex and crossword for example. Instead of the greek letters there are "??????".
On the other hand, Millionaire and Snakes and ladders do work and are able to show the words with the greek letters.
I don't understand why the greek letters appear in some games and not in the other. What could I do to make the crossword, the cryptex and the hangman work with the greek letters ?