Shroom Siege, the team-based arcade action platformer from developer Upside Down Bird, germinates on Nintendo Switch in 2025.

Be a fungi and enlist in the mushroom militia. Aim for victory in one of three ways: Shrine, Shogun, and Poop! Collect and offer small orbs as tribute for a Shrive Victory. Clash swords and eliminate the opposing team’s Shogun three times to secure a Shogun Victory. Push a poopy payload across the map to plant a Poop Victory.

Play with friends in local or online 4v4 matchmaking to test those shroom skills.

More about the game:

The fungus kingdom spreads its tendrils and controls surrounding insectoids to claim dominance. Start as a mini mushroom with the power to infect and sway the minds of mightier life forms. Show off superior shroom strategy in 4v4 multiplayer madness.

Strive for victory in three ways: Shrine, Shogun, and…Poop?! Master multiple mounts to outwit opposing fungi, such as the merciless Mantis, equipped with razor-sharp claws to cut down the competition. Win three of the following Victories to emerge triumphant:

  • Shrine Victory: Command Minions to collect enough small orbs to offer as sufficient tribute to surrounding shrines. Watch for danger and move quick! Minions respawn indefinitely, so going for the Shrine means playing it safe.
  • Shogun Victory: Eliminate the opposing Shogun three times. Control the mighty flying Shogun and cut down any adversary lower than them with its samurai sword. High-risk, high-reward: fatal missteps bring the other team closer to their own Shogun Victory!
  • Poop Victory: Force foes to smell the stench of defeat by mounting a Dung Beetle to slooowly roll a poopy payload to the opposite side of the map. Winners often report this as the most satisfying way to win. Losers often claim it’s the most humiliating.

Each single-screen map makes all characters and strategies visible at all times. Beyond quick reflexes and witty tactics, Shroom Siege also encourages communication and coordination. Gather friends locally or play online, forming two teams of four with cross-platform functionality. Join matchmaking alone or with a squad and test those shroom skills around the world.

“The original version of Shroom Siege was created during the 2023 Global Game Jam,” said Ben Hamrick, Developer at Upside Down Bird. “Like a mushroom, the project kept growing, and we hope others will enjoy our wacky, fast-paced multiplayer game.”

[Email PR]

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