Alliances are a recent addition to Backyard Monsters. They require Players to be on the same Map Server to join an Alliance.
An alliance forms since there's strength in numbers. Right now, the only benefits for being in an alliance are the power-ups and group messages.
|File:Ap armament icon.jpg||Armament||All Alliance members receive an increase to all Tower and Block hit points, as well as increased damage from Booby Traps. Last 12 hours.||12d||12h|
|File:Ap conquest icon.jpg||Conquest||All Alliance members receive 25% discount on Outpost takeovers. Last 6 hours.||14d||6h|
|File:Ap declarewar icon.jpg||Declare War||All Alliance members' Flingers have an increased range, capacity, and target lock time. Lasts 12 hours.||28d||12h|