SWICHT

Two words of the same length are stacked on two rows of a grid — for example BRIDGE and CARPET. A few letters have changed places: sometimes between the two words, in the same column, sometimes within a single word. Drag a letter onto a neighboring tile — above, below, left or right — to swap it with that tile, until both words reappear. Nothing shows which letters are already in place: that’s for you to work out.