Castle Defense 3D

This is a medieval castle war themed 3D tower defense games, in addition to beautiful picture, rich level settings, multiple arms of the enemy, but also the distinctive tower in which to join the defense systems, upgrades and other elements included, and there are various towers can be arbitrarily chosen, each tower has its own unique skills and characteristics, in addition to towers can be upgraded, you can also upgrade for each skill,
 
1,5 kind of special props to use to make the game even more complex
Two, three difficulty settings, there must be suitable for you
3, the arbitrary choice of a variety of defense towers
4, each tower can be upgraded and sold