Keen is a free puzzle game where the player fills in a grid so that each row and column has no overlapping numbers, while also satisfying the math operation in each section. Keen is similar to sudoku and is sometimes also known as KenKen, Calcudoku, or Mathdoku. This app is unofficial and is not associated with Nextoy or the KenKen™ brand in any way. Features: • An unlimited number of levels • Seven different grid sizes • Five different difficulties • A multiplication only option • Undo a