Stack Slayer is defense builder where you stack cards to harvest material, craft equipment, build structures, and upgrade structures for fighting and protect ancient core from the invade monster. You have two field to play with: Battle Field: In this field monster will spawn from the portal and will attack your ancient core. You need to drag soldier and weapon to battle field for fighting monster, protect your core at all cost!!! Board Field (Build Field) In this field you need to harvest, crafting, upgrading your weapon and training your soldier.