Unrevisitable area
Unrevisitable locations are locations in Mario games that are inaccessible after a certain point. Unrevisitable locations are primarily found in Mario RPGs where the player is automatically taken to such locations during the storyline and may contain items. Several platformer games that allow the player to roam on world maps may contain levels that can only be accessed once on the world map, or near the beginning of the game. For this reason, linear games are not listed on this page.
Platformer games
Super Mario World
The four switch palace levels, Yellow Switch Palace, Green Switch Palace, Red Switch Palace and Blue Switch Palace, cannot be accessed after the player steps on the respective switches. Castle levels cannot be reentered again unless the player holds both 
and 
at the same time. In the Game Boy Advance port of the game, the castles cannot be reentered again until Bowser is beaten at least once.
Super Mario Land 2: 6 Golden Coins
Stages containing bosses cannot be accessed again after defeating the respective bosses in each zone. Additionally, the Start stage cannot be accessed again through standard means after completing it.
Wario Land: Super Mario Land 3
Course 10 in Mt. Teapot is replaced with Course 13, an altered version of itself, once the player hits the giant ! Block in Course 12.
Super Mario World 2: Yoshi's Island
The tutorial level Welcome to Yoshi's Island cannot be revisited again after completing the level or exiting it from the menu. In Yoshi's Island: Super Mario Advance 3, however, this level appears again at the end of the secret stage Endless World of Yoshis.
Super Mario Galaxy
Toad Town at the beginning of the game during the Star Festival becomes inaccessible until the player collects all 120 Power Stars during the normal and "Super Luigi Galaxy" modes. The Gate cannot be accessed again until the player recovers the sixth Grand Star from King Kaliente in Bowser Jr.'s Lava Reactor.
Super Mario Galaxy 2
The player cannot replay the short side-scrolling level at the beginning of the game.
Role playing games
Super Mario RPG: Legend of the Seven Stars
Bowser's Keep is locked out for the majority of the game until Mario's party can visit it again via the Royal Bus. The layout of Bowser's Keep is replaced with an extended version upon this second visit. The player can no longer visit Count Down's room in Factory after defeating it.
Paper Mario series
Paper Mario
After defeating the Koopa Bros. in Chapter 1, the large jail cell where Mario meets Bombette has its hole patched up and the player cannot revisit it. After defeating Fuzzipede, the player can no longer navigate inside the whale's body. After the eruption of Mt. Lavalava at the end of Chapter 5, the bottom of the room just before Lava Piranha's becomes unsuitable for Mario to walk on, preventing the player from accessing the chambers beyond. Madam Merlar's cavern in Shiver Mountain becomes inaccessible after placing the Star Stone in the pedestal outside, causing flights of stairs to rise up and block the entrance.
Paper Mario: The Thousand Year Door
The Black Skull cannot be entered inside once Flavio hands the Skull Gem to Cortez at the end of Chapter 5. The storage cabin and the rooftops of the Excess Express cannot be revisited after defeating Smorg in Chapter 6.
After Chapter 7, the X-Naut Fortress and The Moon become inaccessible for the rest of the storyline, but become available again at the post game.
In the Palace of Shadow lies a hidden room connected to Gloomtail's chamber by a passageway that can be accessed by blowing up the eastern wall with Bobbery, which contains an Ultra Shroom and a Jammin' Jelly. Once the player places the Star Key in the pedestal in the Riddle Tower, the floors of the four hallways leading to Gloomtail's chamber give way, preventing the player from accessing these rooms again.
Mario & Luigi series
Mario & Luigi: Superstar Saga
The player cannot revisit Mario and Luigi's house after the player reaches the bathroom when controlling Toad, or Princess Peach's Castle grounds after talking to Bowser to leave for the Beanbean Kingdom. The player can access the Koopa Cruiser only twice: the first visit just before reaching the front of the ship and battling Fawful; the second visit after Joke's End where Luigi navigates through the repaired ship in reverse order before collecting the Beanstar. The Mushroom Kingdom side of Stardust Fields is not accessible after crossing the border to the Beanbean Kingdom.
In Beanbean Castle Town the northwestern, southwestern and southeastern buildings in the western half of the town are inaccessible when the player visits it for the first time, and become inaccessible again after the town's second destruction when the Mario Bros. return after defeating Rookie and Birdo in Teehee Valley. At that point in the game, the northern double-entranced and southeastern buildings in the eastern half cannot be entered again as well.
The underground caverns beneath Chucklehuck Woods after defeating Chuckolator cannot be revisited after Luigi interacts with the barrel with Mario inside it. The player cannot revisit Guffawha Ruins after Luigi collects the Crabbie Grass. The S.S. Chuckola cannot be revisited once it heads out to sea and sinks in the Oho Ocean Seabed. The player cannot revisit the caverns where the Jellyfish Sisters teach the Mario Bros. their techniques after collecting both Pearl Beans.
Mario & Luigi: Partners in Time
The player cannot revisit the Koopa Cruiser when controlling Baby Mario and Baby Luigi. The Shroob Mother Ship cannot be revisited after being ejected from it.
Mario & Luigi: Dream Team
The last two areas in Bowser's Dream where Dreamy Luigi fights Dreamy Bowser become inaccessible after defeating the latter, as the cannon that leads to the first area no longer becomes functional, marked by a green X above it.
Mario & Luigi: Paper Jam
After defeating Bowser Jr. and Paper Bowser Jr., Bowser's Castle in its regular state becomes inaccessible once it rises from its pool of lava and becomes Neo Bowser Castle.
Puzzle & Dragons: Super Mario Bros. Edition
After defeating Bowser in World 8-
Bowser's Castle, the player faces him again with the Koopalings in a multicolored void for the final battle. Once Bowser joins the player's team, the latter area cannot be revisited.
