Sum Square Home Sum Square 0.0 / 5 ( 0 votes ) Your Rating? Discover Sum Square – Play Free Now on GameHard! Sum Square - Good game on RegionGame for your math development and number addiction. Drop the numbers into the colored boxes such that the sum of the numbers equals the required number for each box. Just drag and drop the right number in the color area for level task. Have a nice game! Categories in which Sum Square is included: Multiplayer Running 1 Player