Sunless Sea

The player takes on the role of an Unterzee steamship captain, whose background and ambitions are customisable. The player can win by achieving their chosen ambition, such as becoming Fallen London's most celebrated explorer or amassing enough wealth to retire. Resources to achieve these ends are acquired by discovering new locations, trading goods across the Unterzee, battling ships and "zee monsters", and completing "storylet" quests. There are several roguelike gameplay elements, such as partially randomised maps and permanent character death, but subsequent characters can inherit some of their predecessor's possessions, and a player may create a will to ensure lodging and wealth for their successors.

The actual gameplay consists of two modes: the player controlling the movement of the ship on the map with combat taking place in the same mode, and a story mode where the player is presented with several choices (sometimes accompanied by a skill challenge) in a card-like format. The ship movement is quite slow. This, accompanied by the music, creates an atmosphere of tension.

On 3 September 2013, Failbetter Games launched a Kickstarter campaign to crowdfund Sunless Sea with a funding goal of £60,000. The project was successfully funded, receiving around £100,000 from over 4000 backers. On 13 May 2014, the studio launched a Greenlight campaign to release the game on Steam. The game was approved 15 days later.

On 17 June, the game was soft launched on the developer's website, a Steam early access build was later released on 1 July. The game officially launched on 6 February 2015.

Sunless Sea received mostly positive reviews from professional critics on launch, with the writing and setting being the most highly praised aspects of the game. Aggregate review website Metacritic assigned score of 81/100.

IGN awarded it 8.3 out of 10 saying "Sunless Sea gives you a wonderful world to explore that's packed with memorable written vignettes and danger."