On 13 April 2013, the Extended Edition was released which added new environments, puzzles, a user interface, music, improved graphics, and a new character.

Anna concerns an unnamed protagonist who, after a series of dreams centered around a sawmill nestled somewhere in the Italian mountains, finds an envelope containing photographs of him being in the Val D'Ayas Valley, a location he has no recollection of visiting.

Arriving, the protagonist is met by a locked door he has to force open by operating a mechanism with two halves of a rusty cogwheel.

A backstory is revealed through documents found within the sawmill, puzzles, and observations made by the player: the eponymous Anna was a god worshiped long ago, signifying growth and nature.

One of these men, a sabot maker, discovered the cult that surrounded her through research and, after quickly realizing the house he shared with his brother was built on a long-lost temple, began a ritual to summon her.

A vain attempt to cut the sabot maker's obsession short by his brother failed, resulting in him succumbing to an uncertain fate.

Fearing for her husband's health and commitment, his wife smashes the statue, causing the protagonist to snap and murder his family.

Depending on the player's actions throughout the game, the protagonist will either: leave the sawmill before or after being cursed by going too far in, be overcome by his dwindling sanity and find himself expelled from the house, be told to leave before entering the temple due to a lack of knowledge; be overcome by his obsession and find himself permanently trapped in the temple with Anna's statue, glad that she is with him; or endure the sabot maker's fate by following in his footsteps.

Dreampainters, the development studio, based the story on legends from the Val D'Ayas region of Italy, particularly one about a sawmill where a lumberjack killed his family.

[7] The graphics, story and sound were praised, but it was criticized for the obscurity of its narrative, complexity of its interface, poor translation, and difficulty of its puzzles.