If you can’t flip past an empty Sudoku grid without succumbing to the urge to fill in the squares, grab your lucky pencil and head to Philadelphia Saturday for the largest puzzle competition in the world.

During the second annual Sudoku National Championship, Philly will host about 800 want-to-be puzzle masters from Maryland and across the country. During three 30-minute rounds, competitors, ages 7 to 84, will try to solve three Sudoku puzzles. They’re after bragging rights, $22,000 in prizes and a spot on the U.S. National Sudoku Team.

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