If you're playing a game on your Xbox and it suddenly freezes, there are a few things you can do to try and close the game. First, try pressing the Xbox button on your controller. This will bring up the guide menu, from which you can select Quit to close the game. If that doesn't work, double-tap the Xbox button to open the power menu. From here, you can select Restart or Power off to turn off your console. If your console is still frozen after doing this, you can try unplugging it from the power outlet and then plugging it back in. This should reset your console and close any frozen games.