Certain levels are unlocked by find the secret flagpoles hidden in certain areas.
Special Worlds like the Mushroom and Flower world can be accessed by finding a secret cannon in the following worlds:
World 1 - 1-Fort - Leads to MUSHROOM WORLD
World 3 - ??? - Leads to FLOWER WORLD
World 6 - Complete Game - Leads to STAR WORLD
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you have to beat the entire game as mario and luigi. get a gold flag on every level as mario or luigi collect all star coins
go onto world 8 and go on the final level when you have done that you can go back on world 1 and it will be there does anyone understand that?
Easy. If you unlocked the Volcano tile set, Lava should be in there.
First, u get mini Mario the go to World 2 and beat the boss with mini Mario. It will unlock World 4.
By getting a cannon or by winning the fifth castle and then the sixth castle.