Donut Ghost House
Donut Ghost House is the first of two Ghost Houses in the Donut Plains, and also the first ever Ghost House Mario or Luigi will visit in the game Super Mario World. The level introduces Boos to the game. It also has a secret exit to the Top Secret Area.
It is a short level; however, the player has to use the right tactics in order to finish it. The Ghost House basically consists of three rooms. In the first one, Mario or Luigi just needs to move forward and avoid the Boos and the abysses.
In the second room, the player has no other choice than to use the Door on the right side (unless they have a Cape, in which case they may simply fly to the exit door in the top left corner). When entering, Mario or Luigi finds himself in the very same room again, but this time in a different location. Now, he can choose between taking the same Door again, which actually leads to the third room this time, or to hit the Block above which releases a P-Switch. When hitting the Block, an arrow made of Coins guides the way to another Door. When entering, Mario comes into a small room with a single ? Block. The block, when hit, releases a Coin Snake. If the player leaves the room, he does not reach the third room, but the second again. This means that if not ignoring the P-Switch at least once, the player never reaches the exit of the level.
The third room looks exactly like the second one. However, the Block this time does not release a P-Switch but a Beanstalk, allowing the player to climb up to the exit door. When being in the third room and taking the Door on the right side again, the player once again appears in the second room.
The above-mentioned regular exit, when used, makes a bridge appear that crosses the river in the East, allowing Mario or Luigi to go to Donut Plains 3.
 Secret Exit
There is another exit in the game. Using it requires Mario or Luigi to enter the Ghost House as Cape Mario or Cape Luigi, respectively. In the first room, the player may move forward until they reach the first abyss, then upon reaching it, stop and run backwards until they begin running fast. Upon running fast enough, jumping will cause the player to fly upwards through a gap created by a secret platform that guides the player to a pit that contains four Blocks and a Door. All the Blocks contain 1-Up Mushrooms, and the Door leads to the secret exit with a Giant Gate. When used, a new way opens northwards that leads to the Top Secret Area.