You play as a tank who has to help civilians get into emergency bunkers during an apocalyptic flood. The civilians are scared and helpless and you can choose to lead them with spirit (using flags) or force (by shooting near them using your cannon).

You need to usher the civilians into the bunkers and then manually close the bunker from the outside. If the flood waters reach the same ground level as the bunker while its door is open, all the civilians inside are doomed! Once you have saved as many civilians as you can, there's nothing left for you and your lone tank to do EXCEPT PLAY AGAIN!