I've easily sunk 300+ hours into The Witcher 3 on both PC and PS4, though I'll never fully complete the game. It gave me everything I wanted from an RPG, from the soundtrack to the sidequests. (Image credit: CD Projekt Red / Acapon385) If you love diving simulators then you'll likely love exploring what Subnautica has to offer, but avoid it if you can't stomach sharing your surroundings with sea monsters that want to make a meal of you. Appropriately named leviathan-class predators will hunt you down if you get too close, and with the environment being so dark at times, who can really tell how close anything is? Anything could be stalking you from a blind spot behind you – or at least, that's what my brain is telling me if I spend more than five minutes attempting to play through either of these games.

While the early gameplay is manageable, with crystal clear shallow waters hosting an array of delightful (and non-aggressive) wildlife, you're soon pushed to explore the deeper areas of your watery surroundings. Let's get the obvious out of the way: Subnautica and Subnautica: Below Zero are two open-world survival games from Unknown Worlds Entertainment that share a common theme: you're deserted on an alien planet that forces you to adapt to the hostile aquatic environment. (Image credit: Unknown worlds entertainment)

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