we turn coffee into puzzles

Jumble Pi Sudoku The numbers 1--9 must each appear exactly once in each row, column, block, and color. Note that each colored region is disconnected; for example, the red region is the set of all nine of the red cells. Appeared as a puzzle for the Pi Mu Epsilon Problem of the Month at Longwood University, and at over 35 colleges and universities around the country in various celebrations of Pi Day, March 2007. The clues down the main diagonal form the first eight digits of π.