Wanna play a spot-the-difference game with a twist? Then play Mad World, the free online game. This is not a fair game. You may be thinking you are spotting a correct difference, but there is no guarantees the game is going to take it into account. Wouldn't you like to play this game that challenges your intelligence both ways? Did you forget the game's name? It's Mad World! Use it or lose it! It will sure entertain you.