Top Secret Area is a secret level of Donut Plains in Super Mario World and its remake Super Mario Advance 2: Super Mario World. It has items for Mario and Luigi. The level requires to go to the other exit to unlock the level. The function is somehow similar to the Toad Houses in Super Mario Bros. 3.
The level has five Question Blocks. Two blocks on the left have Fire Flowers, the middle block has a Yoshi inside the Yoshi Egg (the remake can have any colored Yoshi) and the two blocks on the right has Cape Feathers. The level does not have any Time Limit, but the remake has a time limit of 200 seconds.
- There are two location icon changes. The SNES version has a yellow space while the remade version in GBA replaces the yellow space with a smiling green bush.