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Items you collect can be constructed from other items or by collecting resources in game. Typically you'll use various recipes combined with the ingredients you find to make new items.

A game in which the player is not constrained to achieving specific goals and has a large degree of freedom to explore, interact with, or modify the game environment 

Games that can be played alone

Games where the primary goal is keeping the player character alive under harsh circumstances such as dwindling resources or a hostile environment.