Valheim is an open-world survival game developed by the Swedish studio Iron Gate Studio and published by Coffee Stain Publishing, having launched in early access on February 2, 2021, with a full release slated for September 9, 2026, alongside PlayStation 5 and Nintendo Switch 2 versions. Created by a five-person team that began as a side project by co-founder Richard Svensson, the game achieved massive success, selling over five million copies within its first month and being praised as a "rare exception" of a polished early access title.

Set in a fictional tenth Norse world called Valheim within Yggdrasil, players play as slain Vikings who must craft tools, build shelters, and fight enemies across procedurally generated biomes like meadows, swamps, and the Mistlands, with co-op support for up to ten players. Gameplay features a third-person, action-inspired combat system, a health and stamina bar that can be boosted by eating different foods, and a skill system (up to level 100) affecting everything from running to spear usage. The main objective is to defeat eight biome-specific bosses by offering items at their altars, collecting trophies to unlock reusable power-ups, while traveling either on foot or via crafted Viking longships. The game is distinguished by its low-resolution stylized graphics and its core narrative of proving oneself worthy of Valhalla by defeating Odin's sworn enemies.