   deformed maps like gunbound
  how do theyblow up sections of the map? do they use tiles? or 1 still image or what?   
  for the graphical representation of the map they can use whatever they like, might even be tiles, or a still image, or several, doesn't really matter.For the blow up section they most probably use a bitmask, which marks which "pixel" or section of the map is solid, and which was blown up.Look here, there is a nice tutorial on how to do such things:http://jnrdev.72dpiarmy.com/en/jnrdev5/;  thanks dude. seems simple enough. ;-=]   