Normal sudoku rules apply. Clues outside the grid give the sum of the cells along the indicated diagonal. Digits may repeat along these diagonals. In addition, the grid contains two sets of clones: 8 little clones, all identical, which consist of 3 cells; and 3 big clones, all identical, which consist of 5 cells. Clones have an orthogonally connected shape, no two clones overlap. Digits on little clones cannot be the same if they are separated by a knight's move (in chess); the big clones do not touch one another orthogonally but each of them touches a different number of little clones orthogonally. Finally, the grey cell belongs to one of the clones.