Just Follow The Steps. and you will unlock Golden D.A.V.E.
1.Add 3 friends on facebook and if they accept it invite them in backyard Monsters
it will finished if they accepted their friend request.
2.Build. 2x Tesia Tower 2x Laser Tower 1x Hacthery Control Center 5x Hacthery 2x Monster Bunker and 450x Wall.
3.Upgrade. Level 7 Townhall level 3 tesia tower and Laser Tower Level 4 Cannon Tower and Sniper tower. level 4 All Walls Level 10 All Storage SIlo.