Castle Defense : Invasion description

"Through the time-space portal, demons have reached the world of the past. The human kingdom remained unaware that the invasion had begun. The demons began to ally with the aggressive orcs and recruited the fierce monsters.
The young heroes of the human kingdom began to notice the existence of these enemies. Now, it's up to you, commander, to lead us in the fight against the demons. Come and build your defenses to stop the invasion.
----------------------------
*Various defense towers with powerful skills
*Special talent skills that can crush enemies easily
*Free combination of formations that allow various strategies
*Various achievements that are waiting to be collected
*Epic story plus a smooth fighting experience
*Easy, Hell and Quest modes that await challengers"