Rotozoa

Set within a primordial ooze, the player controls a microscopic tentacled organism, known as a rotozoan. The objective of the game is to extend the rotozoan's tentacles by using them to absorb other organisms in the primordial ooze, known as goobugs. To absorb a goobug, the player has to move through the environment and rotate the rotozoan, in order to direct its tentacles to touch it. However, the tentacle must match the color of the goobug that it makes contact with.

If the colours are a match, the tentacle will extend by one segment; but if the colours are a mismatch, the tentacle will break off at the point where the goobug touched it, also resulting in loss of a life. Some of the goobugs in the liquid are easy to absorb, as they simply float about aimlessly, while others may be combative and pursue the rotozoan. If the rotozoan makes too many mismatches with the goobugs it will run out of lives, and the game ends.

Announced at a Nintendo press summit on February 24, 2010, Rotozoa was developed by skip Ltd, under the executive production of Satoru Iwata. The game sports a dark and fluid visual theme, with its graphic design credited to Yohei Kikuchi, while Kazuomi Suzuki's credit for sound design also spans an extensive soundtrack of ethnic beats and chants, fused with atmospheric electronic sounds. According to producer Kensuke Tanabe, the primary focus in the development of an Art Style game is the fusion between "visuals and sounds from an artistic viewpoint, using video games as a method". The soundtrack features a unique song for every stage and mode in the game, adding up to more than 35 tracks.

As the player makes progress extending the rotozoan's tentacles, the music will begin to evolve, adding more elements to the sound. In an interview with Nintendo of Europe, Suzuki explained the concept as an idea of making "exclusive experiences that only can be made in video games", also noting that it has been an integral part of the Art Style project itself since its beginning. This feature can be noticed particularly when a significant amount of progress is lost by the breaching of a tentacle, as the additional elements in the music will simultaneously fade. Similarly, when the player rotates the rotozoan, an additional drum loop will layer with the music for as long as either spin button is held, sporting a unique drum pattern for every stage and mode.

Rotozoa received generally favorable reviews upon release, garnering a score of 68/100 on the review aggregation website Metacritic and 67.43% on GameRankings. Nintendo Life editor Sean Aaron stated that the game "is a real treat for the senses: it's visually beautiful and controls well with an outstanding soundtrack that engages and immerses the player into the simple, but compelling gameplay", giving the game a rating of 9/10. Craig Harris of IGN was also pleased with the game, noting "[it's] definitely one of the higher tier games in the Art Style series: easy to understand, with a fantastic art style [and] several unlockables that change up the gameplay".