How do you beat Hide and Seek in Sniper Assassin 4

Kill the 4 guards working left, right, left, then center.

Shoot guard #1, farthest away, then shoot down the tree branch to cover his body. Then shoot out the light above guard #2 at the far right, before killing him. Then shoot guy #3 at left when he is walking left, and he falls into the bushes. Finally, shoot the center patrolling guard #4 when he is closest to the water fountain, and he will fall in.