In Tranquility: The Descent players work together to descend into the depths in search of Tranquility.

Players take turns placing cards to pave the way for their teammates. Journey together through glittering caverns and underground glades in this exploration of the earth. Like all games in the Tranquility series, The Descent is played in silence. Deep underground you will need to find new ways to cooperate in order to overcome the perils that lurk beneath the surface.

Players must complete the full grid of 40 cards. Starting at the surface players must descend through 5 layers of 8 underground caverns in order to complete The Descent. Rows are completed in order and cards may be freely played anywhere within the row you are working on. Each row must be completed with numbers ascending from left to right before a new row can be started.

The goal of the game is for the team to complete the grid before any player runs out of available actions.

—description from the designer