Question: what is the name of the sudoku type game in which you have to get a ceratin sum? 

Answer: Paul Muljadi discovered magic Sudoku, a Sudoku which contains at least one 3x3 normal magic square anywhere in the solution grid.  The magic constant of a magic square is the sum of numbers in any row, column, and diagonal of the magic square.  The magic constants of normal magic squares of order n = 3, 4, 5, … are\n15, 34, 65, 111, 175, 260, 369, 505, 671, 870 ...
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