Magic square (Play & Learn! Series). Fill in the panels so that the total when you add up columns is the same whether going vertically, horizontally or diagonally. When you are finished, press the "Answer" button. You can change the color of the puzzle from the Settings screen. Try playing with a different color scheme. There are hidden problems in the app.
This download is totally secure. UNI-TY INC. is the creator of Magic square which can be found in the Educational category. The tool has the overall rating 3.4 on Google Play.