Subnautica

The player begins in the still functional escape pod, equipped with a material synthesizer and a distress beacon.

As is the style for building games progress is made by venturing underwater, finding useful minerals, and returning with them to the synthesizer to make new tools.

Once the Habitat Builder is created the player can start building a more permanent underwater home, with every room and amenity laid out as the player wishes.

The next step is to build underwater vehicles to expand the range of their operations, up to and including a submarine that the player can walk inside of.

While the player starts with a small number of schematics most buildable items and equipment upgrades are learned by scanning an intact or several broken examples of items found in the Aurora's wreckage.

The player will find new regions with their own flora and fauna as they journey farther from the starting area, and they will run into ever more dangerous and weird predators the deeper they travel.

The distress beacon will occasionally pick up other messages, directing the player to find the fates of the other escape pods.

At present the game has four game modes: Hardcore (Hunger & Thirst, Power drain, and Permadeath), Survival (Hunger & Thirst, Power drain), Peaceful (Power drain) and Creative (No limits).

Subnautica for Xbox One is currently worth €27.63 loose, €17.47 complete in box, and €34.58 factory sealed. Prices are based on real sales and update regularly on Gamevaro.

Subnautica has a steady sales history on the tracked marketplaces, meaning it trades hands regularly and isn't considered particularly rare.

Loose means cartridge or disc only, CIB (complete in box) includes the original box and manual, and sealed means factory-sealed and never opened. For Subnautica, loose is €27.63 and CIB is €17.47 — CIB commands a premium because original boxes and manuals are fragile and often don't survive.

The PAL version of Subnautica is currently worth €27.63 loose, versus €21.57 for NTSC-U. Regional price differences usually come down to print run size and regional collector demand.