Most games really want people to keep playing after the credits roll. To do this, they often add little secrets and extra content that players can unlock only after they beat the game the first time. The games below really make fans work for it though. There's nothing wrong with making people put in a little effort for their rewards, but maybe some of these take it too far. After all, if post-game content is too hard to unlock maybe some players will just throw up their hands and move on to something else, figuring it is not worth the extra effort and playtime to unlock.