In the center of the ever-expanding Oniverse stands a castle, but for how long? For it is now under attack! As commander of Castellion, rush to build your castle's defense against the strikes of the polymorphic Menace. Laying one tile after the other, erect towers and build keeps to minimize the damages. Unless you feel like discarding tiles to unleash your own special powers? You need to survive, one way or the other.