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Brush up on your mental arithmetic with Sum4. Whether you're young or old, have fun keeping your mind sharp. Sum each group of four numbers to progress to the n...
Sum4
Brush up on your mental arithmetic with Sum4. Whether you're young or old, have fun keeping your mind sharp. Sum each group of four numbers to progress to the next round. Try various levels and keep track of your best performances. Log in with Facebook, submit your score and see how highly you rank! See how long you can last and keep counting!
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