In the previous chapter we created a game called Ultimate Tic-Tac-Toe and implemented an opening screen for it. What did we leave out? Oh yes, the game part. We’ll tackle that in two chapters. In this chapter, we’ll work on the user interface for the game. You’ll be able to play it with another person by passing your phone or tablet back and forth. In the next chapter we’ll give the game the ability to think and make its own moves, so you can play it by yourself.