There's a hidden rule that you must figure out by guessing answers. The earlier you figure it out, the better (since you can click on the correct answers while avoiding the wrong ones).
Note: You are not expected to get a perfect score in this game, since getting some wrong ones early on may be needed to figure out the theme. If you want a hint to start off, check the first comment. *The rule is based on spelling; you don't need to pay attention to the meanings of the words for this one.