From the introduction:
The heart of the labyrinth calls out your name. Your very soul yearns to cross the liminal threshold and delve deep, seeking the promised treasures of ancient times. The labyrinth is a trickster, a living monument god who thrives on the lost and lonely.
Echoes of the Labyrinth is a roleplaying game of minimal proportions. One participant becomes the Heart of the Labyrinth, or Heart. They play the characters and monsters within the monument god’s walls - kind and savage alike. They set the traps, craft the puzzles and adjudicate the rules. The other players are Yearning Delvers - those who have answered the soul call of the Labyrinth. They be warriors, scoundrels and sorcerers.