Alien Shooter 2: Reloaded is packed with hidden rooms that contain vital supplies, powerful weapons, and lucrative cash stashes. Finding these can mean the difference between surviving a horde and restarting the level.
Before talking to him at the end, head to the helipad where a moved crate reveals an Easter Egg. Mission 14 (5 Secrets): alien shooter 2 reloaded all secret place
Hug the Walls: Walk along the perimeter of every large room. Alien Shooter 2: Reloaded – Secret Locations Guide