CalcuDokuEach puzzle consists of a grid containing blocks surrounded by bold lines. The object is to fill all empty squares so that the numbers 1 to N (where N is the number of rows or columns in the grid) appear exactly once in each row and column and the numbers in each block produce the result shown in the top-left corner of the block according to the math operation appearing on the top of the grid. In CalcuDoku a number may be used more than once in the same block. FutoshikiPlace numbers of the given range in the grid 6x6 such that every row and column contains each number exactly once. Inequality constraints must be satisfied. The open end of the sign denotes the greater number. HidokuFill the empty cells in such a way they build a chain of consecutive numbers from 1 to the marked largest number. All cells with consecutive numbers must touch each other either horizontally, vertically or diagonally. BinaryEach cell should contain a zero or a one. No more than two similar numbers below or next to each other are allowed. Each row and each column is unique and contains as many zeros as ones.