Concentration is based on the popular game of the same name. The object of the game is to correctly guess the 5-digit number concealed behind the boxes. The 5-digit number is drawn in such a manner that each digit takes up all 5 vertical boxes. An example of how the numbers look will be shown at the end of the instructions. We recommend that you familiarize yourself with them as it will help in making your guess (they are TRICKY).