After downloading What’s Missing, you begin the game with the first question of Level 1. You are presented with 4 images. The problem is that the 4th image is blank. The answer to the question lies in this image and should complete the logic sequence offered by the other three viewable images.
Once you’ve decided on your answer, you will need to spell it out with the letters that are provided to you, located under the images. Each level consists of a batch of test questions. Successfully answering those questions will advance you to the next level and a new batch of more difficult questions.