Each level of the game contains two portlets - one in which you appear, and another in which you must go. As soon as you destroy enemy security equipment, will open the second portal, where you want to bring the hostages. Remember - if all the hostages will die, you lose and you will have to be level again. After sending the hostages, you can also use the portal. For each saved a hostage, you get extra points. The effective destruction of the enemy, you can collect additional weapons. The transition to the next level of game, weapons collected is not saved. Destroying an enemy you get extra points. Look for the sensor life player - if he will be less than 0, you die and you will have to pass the level the game again. To cure - collect medical kits located at the levels of the game. After the last level of the game you can see the total amount of points you have and save it in the table of records.