on each map there could be a few spots that have a shape like here is the key for the shapes i came up with
plane=air (+1 to attack and can attack up to 2 spaces away)
boat=water (+1 to air -1 to normal spot)
barracks=.....well a barracks (adds +2 to any attack)
and last but not least
main hq=(each colors starting base)
well what do you think?
oh and also maybe a way to actually have a team map/game type