It is played by two people who take turns marking on X or an O on a 3x3 grid. The first person to mark three of their signs in a horizontal, vertical, or diagonal row is the winner. If both players use an optimal strategy, the game will always end in a draw, and this game would become very boring and repetitive.

Most people know that playing first is best in Tictactoe: for much the same reason, achievement games in general favor the first player. There is a simple argument that, under certain conditions, achievement games favor the first player. Indeed, in these games, the first player, playing properly, cannot lose.

The Roku Express 4K Plus is the best streaming device overall right now. We prefer Roku's content-agnostic approach, ease of use, large app library and excellent search functionality over those from other companies. The Express 4K Plus is also usually the cheapest Roku that offers 4K HDR streaming.

For example, if you're using an Android device, you must go into Settings > Display > Cast menu and enable it from there. On iOS devices, this can usually be found under Control Center > Airplay (or Screen Mirroring). With your phone enabled for screen mirroring, it's time to turn on your smart TV's feature.