Cube-X - Phantom Time
A Single Player 3D Old-School FPS with save/load features, dynamic lights and balanced difficulty - it gets harder as you progress through the campaign.
Antartida, 2021. Scientists working for Vorkka INC have made a great discovery: a type of ice which they simply call Ice Rock. It's not water, it's not dead, it's not alive, it's not in the periodic table. In the last contact made by someone there, we've been informed that they found an even more powerful ice rock: the Cube X. Since no other contact have been made in eight months and weird lights started to flash in the skies all around the world, we know that something's wrong.