What are the levels?

Six, set by the width of the paths:

• Very easy: 18 mm paths, ages 3 to 5.
• Easy: 11 mm paths, ages 5 to 7.
• Medium: 7 mm paths, ages 8 to 12.
• Hard: 4.6 mm paths, teens and adults.
• Expert: 3.2 mm paths, adults.
• Extreme: 2.3 mm paths, adults. Choose "First level" and "Last level" in "The mazes" card; the line under them lists the levels of your book with their paths and ages. Narrower paths mean more cells on the page, and so a bigger maze.