Thanks to: Flash Games 247

Description/Instructions:

Play this variation of the ever-popular logic based number placement puzzle. The objective is to fill a 9×9 grid so that each column, each row, and each of the nine 3×3 boxes (also called blocks or regions) contains the digits from 1 to 9, only one time each, the box will flash red if the number you try to enter cannot go there, it'll also show you why not.

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