Fill the grid so every row, column and 3×3 box holds each of the 9 letters exactly once.
The 9 letters all come from one word. When the grid is solved, that word reads across one row and through one 3×3 box (left to right, top to bottom). The row passes through that box, so spotting part of the word can help you solve.
Tap a square, then tap a letter. Turn on Notes to pencil in letters you're considering.
Letters that clash with another in the same row, column or box turn red.
On a keyboard: type a letter to fill, Shift + letter for a note, arrow keys to move, Backspace to erase.