From the game box
This time it's a fierce action-packed battle to free the land of Subcon from the curse of the evil Wart. It's up to you along with Mario, Luigi, Toad and the Princess to fight your way through bizarre multi-level worlds and find him! This time you've got a band new kind of power - plucking power - and now anything you find can be a weapon. But beware! You've never seen creatures like these! Shyguys and Tweeters! Ninji and Beezos! And you've never had an adventure like this! Only cunning and speed can save you now...
Note: released in the US as Super Mario Bros. 2, this is a re-themed version of Doki Doki Panic. Another game titled Super Mario Bros. 2 was released in Japan. This version plays very similar to the original Super Mario Bros.