Underwater world

Aquaria is an action-adventure game, heavily focused on exploration and puzzle-solving, with a 2D side-scrolling design and non-linear gameplay. The player controls Naija, a lone underwater dweller; although similar to a human woman, Naija also has several fish-like qualities, such as the ability to breathe underwater and propel herself quickly with webbed feet. The game, originally only available for personal computers, was designed to be primarily controlled solely through the mouse, though it can also be controlled with a keyboard or Xbox 360 controller. The player directs Naija through an underwater world composed of several distinct regions, ranging from caves to underwater ruins to sunlit oases. These areas are filled with plant and animal life, which can be hostile, friendly, or neutral towards her. Hostile plants and animals can hurt Naija, reducing her health meter, by touching her or firing projectiles at her. In general, Naija cannot interact directly with objects in the world. Instead, the majority of actions are accomplished through singing short tunes. The player does this by selecting a series of notes displayed in a circle of eight choices in the correct order. Each note corresponds with a different color. Singing notes affects plants and objects of the same color as the note, while singing the tunes, once learned through the plot, can lift objects, create a shield around Naija, or change Naija into different "forms" which have different appearances and unique abilities critical to overcoming the various challenges and obstacles found in the game. The specific tones that are played when the player selects a note can subtly change in different regions, matching the background music. The default form, or "normal form", is the only one in which Naija can sing, and is the only one where her appearance is modifiable by the player by having Naija wear costumes found throughout the game. Other forms, which can only be used once found in-game, are the "energy form", in which Naija can shoot projectiles to attack enemy creatures, "beast form", which allows Naija to swim faster through the water and eat small fish to restore health, and "nature form", in which Naija can shoot seeds that produce flowers and spiky plants that can harm other creatures. In this form, Naija is not harmed by thorns on any plants. The player can also learn the "sun form", which allows Naija to give off light in dark regions, "spirit form", which allows the player to move to specific locations marked by blue crystals without time passing, "fish form", where Naija turns into a small, fast fish, and "dual form", found at the end of the game, which allows Naija and another character named Li who is met late in the game's plot to merge, with actions taken by one affecting the other. While exploring the world, Naija can collect various ingredients from interaction with plants and animals, mainly by combating her foes. These ingredients can be used to cook dishes, which have varying effects on Naija. The most common effects are healing and enhancing various characteristics such as speed and defense, but there are some more exotic dishes which grant her new abilities. The player can learn new recipes by collecting new dishes directly, but can also learn them by combining ingredients without first knowing the recipe.