Solve mind-boggling crossword puzzles using math in Cross Sums, a FREE game that challenges your brain.

Test your math skills with this challenging numbers game. To solve the puzzle, the numbers given under the Across or Down headings are the sum of the missing numbers you need to input.

Use the numbers 1 through 9, but do not repeat the same number in any given series. For example, if the answer is 6, then the two possible combinations are 2 and 4, or 5 and 1. Just make sure that the answer matches up with a connecting number group. See how fast you can finish each puzzle, but if you're stuck, don't worry because you can use the Hint button.

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