Tic Tac Toe Showdown is an online mobile game, puzzle game, the goal is the same, 3-in-a-row, but with a twist: players can block their opponents' moves and steal their squares, is free to play on Android and iOS devices, from J-Ho Labs.
Download the game at:
https://play.google.com/store/apps/details?id=com.jho.tttsd&hl=en
https://itunes.apple.com/us/app/tic-tac-toe-showdown/id920936149?ls=1&mt=8