How do I unlock all of the stages in Smash Bros for Wii U?

Solution 1:

The requirements to unlock each stage can be found in this blog post:

• Kongo Jungle 64: Clear the "The Original Heavy Weights" event in Event Match (single player).

• Smashville: Clear the "Playing Tricks" event in Event Match (single player).

• Pokemon Stadium 2: Clear the "Lightning Strikes" event in Event Match (single player).

• PAC-LAND: Play all the maps in Smash Tour.

• Flat Zone X: Play alone as Mr. Game & Watch and destroy 100 blocks in a single game of Trophy Rush.

• Duck Hunt: Get one or more KOs in a single Solo Cruel Smash.

I have confirmed all of these methods and that these are all of the unlockable stages.