Click the first letter and the last letter of the words you find. (No dragging.)
Type all the words into the crossword puzzle any way you can make them fit. Navigate the puzzle by clicking on cells or using the arrow keys. Your typing direction (across or down) is set automatically, but you can hit the space bar to toggle the direction as necessary.
NUMBER FILL-IN PUZZLES
Just like fill-in crossword puzzles, but with numbers instead of words.