Check out this Earth Taken 3 walkthrough post if you want to know how to complete the game and find all the secret rooms.
Earth Taken 3 is an awesome new game from SeethingSwarm and Armor Games and takes place during an alien invasion during a post-apocalyptic era on earth.
You had been held as a prisoner by the aliens but manage to break free and have to go and search for other survivors.
The air is unbreathable for living beings but with the help of a gas mask you can still get around. In the game you have to destroy any robots you come across and basically just stay alive.