After PC Sudoku's success, Planeta DeAgostini decided to make this sequel. This new game includes 4 game types; Sudoku Classic, Sudoku Samurai, Sudoku Killer (also known as Samunamupure) and Kakuro. You can also set up multiple grid sizes for Sudoku Classic and Kakuro.

RESEARCH & DEVELOPMENT

We had to work on this project during Legend of the Dragon's development, so we just worked on the algorithms and interface design. Whe shared the last task with José Luis Cebrián, Freak Frog's lead programmer, who worked on the UI.

Though the original PC Sudoku only used 9x9 and 6x6 boards, we'd still coded a general algorithm that would take board size and cell groups as a parameter, so Sudoku Classic mode needed little work. José Luis contributed many good ideas to improve algorithm performance too. Difficulty quotient was also improved. This new difficulty quotient is much more accurate than the quotient we used in PC Sudoku.

Sudoku Samurai mode was easy to do too, as it inherited many properties of the Sudoku Classic mode. However, it would be the slowest one due to the huge board size. Sudoku Killer mode was a bit harder. Take a solution grid and start grouping cells is easy. However, it's much more difficult to group all cells and avoid single ones. Kakuro was something close to Sudoku Killer, but the implementation is way easier. The point here was to get 'beautiful' boards with big board sizes, above 10 cells. You can't repeat a number on the same sum and you can use digits 1 to 9, so sums can't be longer than 9 cells. So, each row and column have, at least, a black cell. Finding a good place for those cells, avoiding them to fall at the bottom of the board or grouping on the right was a bit tricky.

The game was coded with Visual C++ using old Win32 GUI API as we did in PC Sudoku allowing it to work on old systems (Windows 98 and above)