Sudoku playing board, system and method

A method for playing a problem-solving game comprising:

• i) providing a game board having a first array of n2 identical cavities arranged as a square matrix and at least one second array totaling at least n2 identical cavities arranged in at least n series of n cavities, at least n identical series of n pegs adapted to fit in said cavities in a plurality of definite angular positions, each peg defining a body having opposite first and second end faces, each peg in a series having its first face bearing one of a series of n different indicia, and a plurality of peg identifiers;
• ii) filling the cavities of the at least second array with pegs to form at least n identical series of n different visible indicia;
• iii) moving a number of pegs bearing specific indicia from the at least one second array into specific cavities of the first array to match given data (position-indicia coordinates) of a problem to be solved, and associating one of said peg identifiers to each of said moved pegs to indicate that said pegs represent given data;
• iv) moving pegs from the at least one second array into cavities of the first array or from a cavity of the first array to another so to gradually fill said first array of cavities and thereby form the solution of the problem, said pegs being placed into a first angular position to indicate a sure play, or into a second angular position to indicate a trial play.