Subnautica: Below Zero

Subnautica: Below Zero — the standalone sequel to Unknown Worlds Entertainment's acclaimed open-world survival RPG — lands that feeling hard, and then spends the next 20-odd hours making you feel genuinely small inside something genuinely vast. Now available on iOS and Android for $9.99, ported by Playdigious with an exclusive mobile UI built from scratch for touch controls.

You play as Robin Ayou, a xenobiologist who arrives on Planet 4546B on an unsanctioned mission to find out what happened to her sister Sam, who worked at an alien research station that's since gone dark. The premise is more personal than the first game's marooned-survivor setup, and that's both a strength and, depending on who you ask, a mild irritant. Robin talks a lot — to herself, to a mysterious alien consciousness she gradually befriends — and for players who loved the original Subnautica's crushing silence, all that chatter takes some getting used to. But the mystery she's unraveling is good. It earns its ending.

The world she moves through is stunning. Below Zero trades the first game's tropical ocean palette for something colder and stranger — crystal caverns that shimmer faintly blue, kelp forests under ice sheets, thermal vents that erupt without warning if you linger too close. There's a pocket of the map called the Twisty Bridges that manages to feel calming and deeply alien at the same time, which is harder to pull off than it sounds. The Sea Truck, the game's new modular vehicle system, lets you customize a kind of underwater train of attachable compartments — aquarium module, storage, fabricator — and driving it through those biomes is satisfying in a way the old Seamoth never quite achieved.

The mobile port by Playdigious is a proper adaptation, not a straight conversion. Cloud saves let you carry progress between phone and tablet seamlessly, MFi controller support is there if touch controls feel slippery in combat, and the game runs well on mid-range hardware. No in-app purchases, no energy systems — it's a premium, offline-capable survival game priced the same as a large coffee-shop order. Compared to the original Subnautica (which also hit mobile in 2025 at the same price), Below Zero is slightly shorter and a bit more linear, which some players see as the whole point. It holds a 91% rating on OpenCritic across critic reviews from its PC and console releases.

Where it stumbles is repetition in the resource-gathering loops, and some players find the above-ground sections — a glacial basin with Arctic weather mechanics and hypothermia to manage — less compelling than the underwater exploration they came for. The surface sections aren't bad, they're just not where the magic lives. And the magic, when it hits, still hits hard: descending alone into the Shadow Leviathan territory with a dying flashlight and a half-charged Seatruck battery is the kind of moment you don't forget.