15 Most Challenging Open World Video Games

Subnautica

Unknown Worlds’ underwater survival game, Subnautica sees players uncovering a myriad of secrets of the planet 4546B. The game boasts a beautiful underwater ecosystem with a great variety of flora and fauna, which can be hostile at times. Surviving the world is pretty difficult, as players need to keep tabs on a multitude of stats and resources at all times. As you venture deeper into the sea, enemies start to become more hostile and you will constantly have to keep grinding for better gear to have a shot at survival.