The Legend of Zelda: Twilight Princess is a 2006 action-adventure game developed and published by Nintendo for the GameCube and Wii. Originally planned for release exclusively on the GameCube in November 2005, Nintendo delayed the release to refine the game, add more content, and port it to the Wii. The Wii version was a launch game in North America in November 2006, and in Japan, Europe, and Australia the following month. The GameCube version was released in December 2006 as the final first-party game for the console.

The game takes place over a century after Ocarina of Time and Majora's Mask, in an alternate timeline from The Wind Waker. Players control Link, who tries to prevent Hyrule from being engulfed by a corrupted parallel dimension, the Twilight Realm. He takes the form of both a Hylian and a wolf, and he is assisted by a mysterious imp named Midna.

Twilight Princess received critical acclaim, with praise for its art direction, combat, level design, and story. It received numerous game of the year awards, and has been called one of the greatest video games ever made. By 2015, it had sold 8.85 million copies worldwide, making it the best-selling Zelda game until Breath of the Wild (2017). In 2011, the Wii version was rereleased under the Nintendo Selects label. A high-definition remaster based on the GameCube version, The Legend of Zelda: Twilight Princess HD, developed by Tantalus Media and Nintendo EPD, was released for the Wii U in March 2016. An eleven-volume manga series based on Twilight Princess by Akira Himekawa was published between 2016 and 2022.

The Legend of Zelda: Twilight Princess is an action-adventure game focused on combat, exploration, and puzzle-solving. It uses the basic control scheme introduced in Ocarina of Time, including context-sensitive action buttons and L-targeting (Z-targeting on the Wii), a system that allows the player to keep Link's view focused on an enemy or important object while moving and attacking. Link can walk, run, and attack, and he will automatically jump when running off of or reaching for a ledge. Link uses a sword and shield in combat, complemented with secondary weapons and items, including a bow and arrows, a boomerang, and bombs. While L-targeting, projectile-based weapons can be fired at a target without the need for manual aiming.

The context-sensitive button mechanic allows one button to serve a variety of functions, such as talking, opening doors, and pushing, pulling, and throwing objects. The on-screen display shows what action, if any, the button will trigger, determined by the situation. For example, if Link is holding a rock, the context-sensitive button will cause Link to throw the rock if he is moving or targeting an object or enemy or place the rock on the ground if he is standing still.

The GameCube and Wii versions feature several minor differences in their controls and gameplay. The Wii version uses the motion sensors and built-in speaker of the Wii Remote. The speaker emits the sounds of a bowstring when shooting an arrow, Midna's laugh when she gives advice to Link, and the series' trademark "chime" when discovering secrets. The player controls Link's sword by swinging the Wii Remote. Other attacks are triggered using similar gestures with the Nunchuk. In the GameCube version, players can control the camera freely, without entering a special "lookaround" mode required on the Wii; however, in the GameCube version, only two of Link's secondary weapons can be equipped at a time, as opposed to four in the Wii version.

The game features nine dungeons—large, contained areas where Link battles enemies, collects items, and solves puzzles. Link navigates these dungeons and fights a boss at the end in order to obtain an item or otherwise advance the plot. The dungeons are connected by a large overworld, across which Link can travel on foot; on his horse, Epona; or by teleporting with Midna's assistance.

When Link enters the Twilight Realm, the void that corrupts parts of Hyrule, he transforms into a wolf. He is eventually able to transform between his Hylian and wolf forms at will. As a wolf, Link loses the ability to use his sword, shield, or any secondary items; he instead attacks by biting and defends primarily by dodging attacks. "Wolf Link" gains several key advantages in return—he moves faster than he does on foot as a human, digs holes to create new passages, and uncover buried items, and has improved senses, including the ability to follow scent trails. On his back, he also carries Midna, a small imp-like creature who gives him hints, uses an energy field to attack enemies, helps him jump long distances, and eventually allows him to "warp" to any of several preset locations throughout the overworld. Using Link's wolf senses, the player can see and listen to the wandering spirits of those affected by the Twilight, as well as hunt for enemy ghosts named Poes.