The Batman games are absolute classics and act as the perfect demonstration of what can be done with a licence when the developer actually gives a crap about the product that they are putting out. In the brilliant Arkham City, Batman gets infected with a disease caused by Titan mutating in Joker's blood and spends much of the game searching for the cure. He eventually gets a call from Alfred telling him that a cure has been found and players promptly head off to go get it. So starts one of the biggest mindbenders in gaming history, as Bats is subjected to mental torture by the Mad Hatter that starts of weirdly enough with a table full of people wearing terrifying rabbit masks and only gets worse from there. Bats is then transformed into some weird rabbit version of himself and ends up fighting tons of hallucinated rabbit men on top of a floating clock face before finally bring Mad Hatter to justice. A true WTF moment that easily competes with the Scarecrow levels of the previous game.