She's Got A Key is a mystery game in which two to four players take on the role of explorers trapped in an underground facility and try to find their way out. Each player has their own marker; a pawn of a certain color.
When the game begins, there will be a pile of World Tiles, square pieces that have various tunnels and intersections on them. Players take turns placing these squares until all of the squares are placed, or until they decide to stop, making a labyrinth of at least fourty tiles, none of which are disjoint from the rest of the maze. It is fine to have dead-ends so long as it does not keep the maze from being made up of at least forty tiles. The youngest player starts. Once the labyrinth is finished, each of the tiles should be flipped upside down.
Once the maze is created, the players go to the Secret Pieces, round pieces that have various treasures, a key, an exit, or a murder scene on them. It is critical that these are placed somewhat away from the first tile, which is where the players will start, but they do not have to be at the ends of the game paths. These should be shuffled or jumbled up in a pile, and left face down, then placed on the board in secret. All ten of these pieces should be placed.
The goal is to search as quickly as possible to get to the exit; each of the treasures has a point value (printed on the token) and the final score for a player will be determined by the items they find. The first player to find a key unlocks the exit and they can leave whenever they get to the exit, if they are satisfied with their collection; remember that the key by itself is worth no points.
Each turn a player may choose to either light tiles or move into the dark; if they choose to light tiles they may flip over four tiles in a path away from themselves; these tiles must follow the normal rules for movement; they must be adjacent and have a connection to each other on them. Alternatively, the player may move one tile, turning it over before they move their pawn to it; they may decide to stay in their current tile if they feel moving to the tile they just uncovered would be disadvantageous.
This is where the second part of the game comes in. In addition to exploring to find the exit, one player is the murderer; their goal is to make sure that if their crime is discovered nobody else leaves to tell of their crimes.