The Picture of Dorian Gray
Oscar Wilde's portrait, and the epigrams around it.
242 cryptograms drawn from it, every one by Oscar Wilde.
How hard they are
56 easy, 107 medium and 79 hard, graded by the model described in our guide to solving cryptograms.
They average 69.1 letters over 18.9 distinct ones, with 4.3 letters appearing exactly once.