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version 2.1.13: improve time display
Version 2.1.12: correct a bug when running the game on Windows
Version 2.1.11: correct a bug which prevented the time to be properly displayed
version 2.1.10: improve best scores list
version 2.1.9: really fix problems with Wx 2.8 and add best scores
version 2.1 8: various updates to match Mandriva Linux 2008.1 requirements
version 2.1 7: various updates to match Mandriva Linux 2008.1 requirements
version 2.1.6
version 2.1.5: make an X sudoku even more difficult
