New Super Mario Bros. Unlockables

First, you must beat the game (1st star). Next, you have to unlock all worlds (4 and 7, if you haven't already) and stages, including cannons. (2nd star). This enables unlimited Toad House visits. For the final star, you have to get all of the Star Coins in the game. Then, buy all of the Toad Houses and hidden stages, and visit the blue Toad House and buy the rest of the Touch Screen backgrounds. Instead of a Star Coin counter (stars x 00, etc.), you will see "All * spent." Save, quit, and go on again. The next time you play, you should have three stars on your profile!