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Practice improvements in “Professor Layton and The Pandora's Box” measured by difficulty levels of the solved puzzles. The graph only extends to 13 h on the x‐axis because from that point several participants systematically finish the standard game: three in 13 h, one in 14 h, one in 15 h, and one in 16 h. These six participants keep playing but using problems that cannot be compared with those organized for the standard game.
