I agree with bunjamins and David5317, having the game change color scheme or terrain after each match would make the game more interesting. Maybe even make it where terrains provide bonuses for certain tiles (for example, planes could do 5% more damage over plains). That might be difficult to implement though, just thought it'd be a neat idea to add more strategy to the matching game!
 "War Memory (BETA)"){kind=icon}
Thank you for the great ideas. Bonus in certain terrains are a good way to create new strategies, we are going to try something in this way.