There are two levels of X-oku: QuiX-oku, which contains a ‘quick’, non-cryptic crossword, and CryptiX-oku. The sudoku’s solvability is colour-coded: green (easy), amber (medium), red (hard). The two parts of the X-oku cannot be completed separately. Surplus letters from the crossword appear in the sudoku, and shaded sudoku squares determine the position of some crossword solutions. For an explanation and examples, check the F-words and FAQ pages, accessed via the Clues pane.
So click on today’s puzzle, pick a coloured pencil, and solve your first X-oku, typing letters and drag-and-dropping numbers.