Mycelia is a dynamic game of tactics in a competition for space and resources to create your own mushroom kingdom. Grow mushrooms to score points, spore them to expand your mycelial network, and watch them decay to unlock special actions.

On a turn, you have two actions to perform from the six options available. Using your decay actions, stealing spores, and blocking other mushrooms are just some of the ways to get ahead in the game. You can evolve your own playing style, perhaps playing more aggressively to steal other players' spores or disrupt their mycelial network — or perhaps playing more defensively to try to protect your own area and spores.

The board is made up of triangle tiles that represent different environments and nutrients that the mushrooms need to grow. These tiles can be added to the board by the players, so the board is always growing and evolving.