Tunnel Wars
Instructions:
Use the arrow keys to move your tunneler. You may only drill through three squares per turn, but you may move any number of spaces in tunnels that have already been created. Press the space bar to end your turn, and the escape key to open the menu. At the end of the turn, any elements that can move will flow a few spaces. These elements will damage cities or destroy tunnelers. A destroyed tunneler will reappear in your base at the beginning of your next turn. The game ends when one city is destroyed.