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Ludum Dare is a 48 and 72 hour game making competition globally hosted twice a year publicly on the internet for anyone to participate. The 48 hour version is strictly for solo participants, while the 72 hour version is relaxed bit with more time and no restraints on team size and source code usage.

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.