Start a new game of Go Fish. You will have a chance to memorize everything Mr. Big Pig is asking you for, as long as you need to. When he is about to win, exit the app (double tap 'Home button and swipe app out). When you restart the app, the game should resume where you last left it except this time your Go Fish game will be reset with you having all the answers. You can now play the game knowing exactly what Mr. Big Pig is going to ask you for and win every time.