This is a major update of the game 'The Kaiyō Mission’ (under development). Besides three different mission phases that are set on underwater plateaus of alien ocean worlds, including the Saturnian moon Enceladus and Jupiter’s moon Europa, the game now contains a ‘chill out’ tutorial level that can be accessed before starting a mission or at any time later during the game play. Furthermore, a central compendium for all identified animals, plants and underwater features, as well as some minor improvements have been implemented. 

In the first mission phase, the player has the mission to steer a solar-power-driven, robotic submarine on Enceladus, and to identify and take pictures of underwater features, plants, and animals. The second mission phase is undertaken starting from Earth, with human deep-sea explorers documenting various life forms and underwater features, extending the previous mission phase based on the areas and species already explored on Enceladus. The third mission phase takes the player to a plateau on Europa… This phase offers the option of using advanced underwater transportation devices to further extend the reach of the human explorers, and enable them to make contact…