Robot Master is an easy to learn puzzle game from the mind of award-winning game designer, Dr. Reiner Knizia.
How does it play? Take turns placing numbered cards down on a 5 x 5 grid to score lines both vertically and horizontally. The scores for each line are determined by the sum of the cards.
That's all there is to it but remember that your final score is only your lowest scoring line, and you want the highest score possible!
Source: The Developer Website.