Alternative Origin addon - Episode Secret Weapon mod for Half-Life

Secret special unit called the Combine Soldiers are developing a secret gun. About this weapon, however, that no one has really seen. Your task is to find the factory where the new weapon developed, destroy all plans. I dont know what to do in the room with the toxic gas, i used noclip When you eliminate all the soldiers and helicopters, the game end. There is a bug at the beginning of the game: G-man would have to kill the soldier, but it does not. You have to put the game in normal or easy, because in hard mode G-man does not kill the soldier. Also check my uploaded maps.