Diablo 3's secret level has been discovered, which is an evolution of Diablo 2's secret Cow level.
Taking inspiration (and making fun of it in the process) from the "Diablo 3 is too colourful" complaint by players, the cartoon-centric land is entitled Whimsyshire. The level sees random and elite bosses appearing, as well as offering players gold and item drops.
Players can access Whimsyshire within Act One via an accumulative of five ingredients, in addition to the Staff of Herding plan. However, the inhabitants aren't a pushover with Act Four difficulty incorporated in the secret level's creatures, while low level characters can be killed easily, even on Normal difficulty, apparently.