Nautiles is similar to the very popular Bejeweled in that you must match rows and columns of three or more. The more blocks in a row or column that you match up, the more points you get. You can only swap blocks of the same symbol and color. You'll move on to the next levels as soon as you hit the minimum amount of points in the time allotted. Watch out for the eyes of the skull. When it appears, click on it and it will destroy all the tiles on the screen that match the color of the eyes. This may sound easy but you must be fast and you'll need to set up combinations of more than three if you want to keep moving through levels.