To select a word, click your mouse on any block which comprises that word or select it from the drop-down menu below the crossword. The blocks of the selected word are highlighted in yellow and the current block is highlighted in blue. Also, the clue for the selected word will always be shown in the drop-down menu.

You can change the orientation (Across/Down) at any time by clicking in the active block. Letters are entered via your keyboard and the current block will advance by one with each letter you type, until you reach the end of the word. Incorrect letters are displayed in red, while correct letters are shown in black. If you type an incorrect letter, you can either use the backspace key on your keyboard or simply click in that block and re-type the letter.