Sotto Terra is a free interactive game with a detective storyline and puzzle-solving gameplay.

The main character is the dreamer, the protagonist of the story, who wakes up in a mysterious tunnel. In this world, the laws of physics and the boundaries of our physical reality are questionable, and the only way to survive is to find out what is the truth and what is real.

The detective storyline is a quest for the truth. The dreamer must find his way out of the tunnel, and to find the answer to the mysteries, he will have to solve puzzles and make choices.

Sotto Terra is a free game with no need for payment or downloads.