If you like this game, be sure to try these:
-----   Math Lines: xFactor   -----   Math Lines   -----   Subtraction Blast   -----

Click on the number you want to work on:
4    5    6    7    8    9    10    11    12    13    14    15

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Game Instructions:

Delete balls by matching up twin pairs that add up to 10...  Balls can only be matched by an invisible line that doesn't make more than two turns.  (No other balls can be in the path.)  Another way to say this is to say that balls can be matched by either one or two or three straight lines.