The object of the game is to discover the word which is hidden in the darkness, with as few clicks as possible.
The game board is a black region of your screen, and inside that black region there is a word (written in black letters, so you can't see it!). You have a flashlight (your mouse) with which you can reveal regions of the screen. Click anywhere in the darkness to flash your flashlight on the sceen, and find the word.
Once you find the word, use your flashlight to reveal letters until you can guess the word.
Once you know what the word is, type it in the space below the darkness and click Submit. If you are wrong, you will be penalized two clicks.