to change the current cell. The program prevents you from entering obviously incorrect answers, and plays a beep. restrictions to decide what values the empty cells can take. The initial configuration is usually chosen so that Complete the grid such that each row, each column, each 3x3 box contains the letters 'ADEIKOSTU'. The solution contains a hidden word or phrase! Complete the grid such that each row, each column and each 4x4 box contains the digits 0−9 and the letters A−F.

Complete the grid such that each row, each column, and each 3x3 box in each of the two puzzles contains the digits 1−9. Ross, P., Corne, D., Fang, H.-L.: Improving evolutionary timetabling with delta evaluation and directed mutation. In: Davidor, Y., Schwefel, H., Reinhard, M. (eds.) Parallel Problem Solving from Nature III (PPSN). Lecture Notes in Computer Science, vol. 866, pp. 556–565. Springer, Berlin (1994) Complete the grid with the digits 1-6 (1-9 for 9x9 puzzle) so that each row and each column contains one in which each element occurs exactly once in each row, column, depth, and subcube. The structure of these cubes is based on cyclotomic cosets of Lourenco, H.R., Martin, O., Stützle, T.: Iterated local search. In: Glover, F., Kochenberger, G. (eds.) Handbook of Metaheuristics, pp. 321–353. Kluwer Academic, Norwel (2002)

Armstrong, S.: X-wing and Swordfish. Online resource. http://www.simes.clara.co.uk/programs/sudokutechnique6.htm (accessed July 2005)

Complete the grid such that each hexagon (around the circles), the set of triangles containing filled dots, and the set of triangles containing open dots contains the digits 1−6. Puzzle: sets up three puzzles, number 1 is average (around 20mins), 2 and 3 are hard (up to 40 mins each) Leaflet of simple Jigsaw su doku puzzles (6 puzzles: 5x5) suitable for ages from 9 to 13. [ Answers]Prequel Scarlatiny přichází s ještě temnějším příběhem pro fanoušky Tima Burtona | RECENZE Smaragdina Complete the grid such that each row, each column, each 3x4 box contains the letters 'ACEHIKLMORUV'. The solution contains a hidden word or phrase! Colbourn, C.J., Colbourn, M.J., Stinson, D.R.: The computational complexity of recognising critical sets. In: Graph Theory. Lecture Notes in Mathematics, vol. 1073, pp. 248–253. Springer, New York (1984)

Complete the grid such that each row, each column and each 2x2 box contains the digits 1−8. Each cell contains two digits, and the upper left digit is always smaller than the lower right. Complete the grid such that each row, each column, and each 3x3 box in each of the eleven puzzles contains the digits 1−9.My experience in generating these puzzles allowed me to design a "super" Su Doku puzzle on a 16 by 16 grid for the Saturday edition of the Independent, and a "letter" Su Doku puzzle called "Go Doku" for the Independent on Sunday (Go Doku has letters instead of digits and a surprise name inside each puzzle). I have since created a whole range of sudoku puzzle variants: including the double puzzles and jigsaw puzzles which appeared in 'The Big Book of Su Doku 2' and 'Extreme Su Doku'. For Christmas 2005, I worked with Orion Press to create Celebrity Su Doku, a combination of go doku, cryptic crosswords and wordsearch for new puzzle challenge. More recently I have been working on Kakuro puzzles too.