Mystery Land is a board set in some ancient ruins in Mario Land in Mario Party 2, and features several Mario-based parodies of real-life cryptozoogical and historical mysteries. It is divided into four areas, to which people warp to each time they land on a Happening Space. They can also pay 10 coins to have a Bob-omb UFO take them to another area, but sometimes the UFO will malfunction and take the player to a small area with ruins resembling King Bob-omb. Other interesting features on this board include the Shy Guy's Curse House, where a player can pay 5 coins to curse themselves or another player to reduce the number on their dice block to 1-3, rather like the Poison Mushrooms from later Mario Party games. The Item Minigame is Mallet-Go-Round, and the Duel minigame is Psychic Safari.
At the end of the game when Toad is about to announce the winner, he is interrupted by a red Koopa Troopa who comes and alerts the players that the treasure has been found. A cutscene then shows a green Koopa with a golden Bob-omb statue. Then the villain of the board, the Bowser Sphinx, comes to challenge the Koopa to guess a figure shrouded in shadow. The Koopa guesses incorrectly, saying that it is a cow, and Bowser curses the Koopa by trapping him in a rock. Then, the winner of the game comes to confront him. The winner guesses Bowser's shadow riddle correctly, saying that the figure is him. The Bowser Sphinx disappears, a consequence of having his riddle guessed, and the statue breaks to reveal a Bob-omb Buddy that was trapped inside. The other Bob-omb Buddies come to take their rescued comrade away on their spaceship and takes Bowser in their custody. The winner of the board is then congratulated by the other players, Toad, Koopa, and a Star.
Bottom right area
This is where the players start. This area contains a Shy Guy's Curse House, a Koopa Bank, and a spot where the player can summon a Bob-omb UFO to take them to the top left area. It is the only one of the four main areas without a Bowser Space. A crashed airplane with a Goomba on the tail can be seen here.
Bottom left area
This area is Egyptian-themed and features a pyramid, some pillars, and a Nazca Line-esque imprint of a Blooper. The Item Shop is here, and there is a door which allows players to willingly access the upper left or bottom right area if they have a Skeleton Key. It is the only one of the four main areas without an Item Space.
Upper left area
This area features a Koopa Bank, Boo, and a spot where the player can summon a Bob-omb UFO to take them to the bottom right area. It is the only one of the four main areas without a Battle Space. Dorrie can be seen above this area, in a parody of the Loch Ness Monster.
Upper right area
Moais can be seen in this area, as well as a monument resembling Stonehenge with a limbless Whomp on top. This area contains a Chance Time Space and a Shy Guy's Curse House. There is another Skeleton Key door here, which serves the same purpose as the one in the bottom left area. In the forest, Peach's Castle is somewhat visible through the fog.
King Bob-omb ruins area
This small area is not normally accessible, but a player may be randomly sent here after summoning a Bob-omb UFO. It consists of nothing but Red Spaces and Happening Spaces. A statue of King Bob-omb can be seen in the central sinkhole.
The following table shows how many spaces there are on the board, and how many there are of a certain type.
Names in other languages