we turn coffee into puzzles

Fool's Feast Sudoku Fill in the grid so that each row, column, and jigsaw region contains exactly the letters in "FOOL'S FEAST". Note that the letters 'F', 'S', and 'O' must each appear twice in each row, column, and region. Appeared at the American University Department of Mathematics and Statistics, Washington, D.C., for a lecture by Laura Taalman at the Fool's Feast Celebration, March 2007.