The player explores randomly generated open 2D-world. Realistic physical and chemical processes occur in the environment. There are gases, liquids, temperature, pressure, chemical reactions and radiation. Player has to create complex mechanisms using mechanics, gear wheels, pneumatics, hydraulics, chemical processes and electricity. This will allow him to build complex mines and produce rare resources needed for more complex mechanisms. Also, the player will have to deal with various obstacles in caves and mines. In a depths of the earth, he confronts with landslides, floods, poisonous gases. He can overcome that only by means of using more and more sophisticated and complex mechanisms.