Move your mouse to highlight a column, clicking the block at the bottom of it to pick it up or swap it with the one you're holding. Click an empty space at the end of a column to place a letter. Create words in rows or columns (when a word is recognized, it will be highlighted), and then click Submit. You get extra points for creating the words listed to the right. When the timer bar fills up, a new row will be added. Click the timer to request a new row early. When the dragon fills up, you will go on to the next level. Don't let the letter tiles reach the line at the bottom of the screen.