Story

''This page concerns the Game Mode under the tab labeled 'Story' on the Main Menu. For information on the events that take place within the game, see Plot and Endings. For Information beyond the in-game events, see Lore of Rain World for the world defined within the Base Game content, and Lore of Rain World: Downpour for a separate comprehensive covering on the world of Downpour.''

Story Mode is the main game mode featured within Rain World, with a selection of 3 campaigns in the Base Game, each corresponding to the journey of a different Slugcat; The Monk, The Survivor, and The Hunter. The Downpour DLC adds five new Slugcat campaigns; The Gourmand, The Artificer, The Rivulet, The Spearmaster, and The Saint, alongside an additional 'secret' campaign.

The Monk campaign corresponds to an 'easy mode,' featuring less hostile and deadly Creatures alongside various assists. The Survivor campaign is the default and original experience of the game, corresponding to a 'normal difficulty.' The Hunter campaign corresponds to a 'hard mode,' unlocked by completing The Survivor Story, featuring new more hostile and deadly Creatures, with a general improvement in player stats alongside the ability to store an additional Spear on the Slugcat's back, with the main pressure being a time limit of 20 in-game Cycles.

With the Downpour DLC, the first new Slugcat Story is The Gourmand, a rotund and gluttonous creature that can use their mass to their advantage but often times as a detriment to their agility, capable of utilizing an array of items to craft a new item, alongside using two different foods to craft a 'meal,' gaining extra food in the process.