The image above shows you the first crucial part of the Guess game. The black container houses the prompt with a blank space in it. You must attempt to fill in the blank using the text input (scroll down). If you fail to guess the missing word, then you may use the give up button which shows up after ~10 seconds.

The image above highlights the second crucial part of the Guess game. The empty spaces with rectangles underneath indicate the place where you need to enter the word your guessing. When you start entering the word, the boxes will start to turn green or red. Green indicates that the letter you typed is in the word at that place. Red indicates that the letter is not in the right place or is not in the word at all. Once you type the word in correctly the game will automatically end.

The image above the highlights the end screen of the game. After you have given up or guessed the phrase you will see the page above which reveals the fact, allows you to play again, and give you a way to verify the fact if you are palying the fun fact edition.