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Version 1.5 was a major update for the survival platformer Rain World . It notably added: Rain.World.v1.5.rar
Competitive and sandbox modes for up to 4 players. If you are looking at this post on
The Monk (easier journey) and the Hunter (harder journey). Expanded World: New regions and creatures. Rain.World.v1.5.rar
It doesn't contain obvious malware or viruses.
The .rar file isn't corrupted and can be extracted.