Retro Invasion is an Alpha Version Game Information: In Retro Invasion you can choose which game mode you want to play, in Campaign mode you have to kill and stop the monsters, the monsters are not allowed to conquer the world. In Invasion Mode you have to kill all monsters and finish each level without dying, if you don’t make it it starts again. But if they succeed then the monsters have no changes to conquer the world. Key cards information: The key cards are important because you cannot enter any other room without a key card, of course there are also rooms where you do not need a card. You will find the key cards in each level. Choose carefully which room to open first, if you open a room it may happen that you are in a other room can no longer enter, this is of course not old so bad but optionally it should not happen. The key cards have different colors (Red/Yellow/Blue) Weapon information: In Retro Invasion, they have different weapons to fight the monsters. Weapons available (pistol/minigun/shotgun/rocket launcher/Uzi) the weapons don’t have to be found or collected. All described weapons can be used directly. Game Modes: Campaign Invasion