[mobile] [before 2018] a simple colour changing board game Vs an opponent

I used to have such an addictive game on my phone but I can't figure out how to find it now. It was a board full of different coloured squares, and you and your opponent started as diagonally opposite single squares. You could change the colour of the square, and each time you did you collected the squares around it that were the same colour. The winner was the first to take over 50% of the board

Thanks for any help!