However, if the slugcat has not eaten sufficient food, it will not be allowed to hibernate normally. If the player does not reach the hibernation point before the end of the day cycle, a crushing rain will pour, flooding the world and ensuring the slugcat dies through drowning or being pummeled by the rains. Hibernation resets the day cycle and saves the player's progress.

The slugcat can jump, swim, and climb poles to avoid enemies while foraging for sparse food, which is used to hibernate in scarce, designated safe rooms. The player is given little explicit guidance and is free to explore the world in any direction via pipes and passages that pass through over 1600 static screens, each with enemies that spawn in set locations and can then move from screen to screen. The player's character, referred to as a 'slugcat', uses spears and rocks to survive in a hostile, ruined, and obtuse 2D world. Rain World received early attention for the 'uncanny fluidity' of its animations

Release is expected for Switch, PS4, and Xbox as well, implied to happen in June. In January 2023, a downloadable content pack titled Rain World: Downpour was released for PC. Some of these criticisms were addressed with later updates. Rain World received mixed reviews from critics, who praised its art design and fluid animations, but criticized its brutal difficulty, inconsistent save points, and imprecise controls. The player is given little explicit guidance on how to survive, which was the intention of the developers, who wanted players to feel like a rat living on subway tracks, in which they learn to survive in an environment without grasping its higher-level function. The slugcat uses debris as weapons to escape enemies, scavenge for food, and reach safe hibernation rooms before a deadly torrential rain arrives. Players assume control of the 'slugcat', an elongated felid-like creature, and are tasked with survival in a derelict and hostile world. Rain World is a 2017 survival platform game developed by Videocult and published by Adult Swim Games and Akupara Games for PlayStation 4 and Microsoft Windows in March 2017, and for Nintendo Switch in late 2018.

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