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SteamWorld Dig is a steampunk western that combines a platformer and a sandbox, according to the developers a hybrid of Super Metroid and Terraria.
Arm yourself with a pickaxe and go underground, look for water, minerals, precious metals and various traces of the presence of people and their technologies. Descend for kilometers, but be careful, it is easy to die at the bottom, running into some monsters, but this is not the main problem: it is easy to climb down, but it is not easy to get out to the surface.