Viking, Romans and Pirates are all in a battle with one another and you will take the role of leading the ninjas. This game is all about combining your ninjas so that they transform into a bigger and more powerful ninja. You can also break them down though to into your smaller ninjas so it like you always have an extra ninja in your pocket. For ever enemy your destroy you will be rewarded with coins. These coins can be used to purchase skill upgrades, and increase the overall attack and defense of all ninjas.