What would the easiest way be to select a certain type of block on your map. Perhaps only in a 200-300 block radius which ever is easier. (I want to destroy a wall in the game when the game starts.)
Automatically or manually? You could use WorldEdit if it's manually. Just use /removenear <block>, where <block> is the material of your wall.
pseudocode: Location center = new Location("world", 0, 0, 0); for (int x = -radius; x <= radius; x++) for (int y = -radius; y <= radius; y++) for (int z = -radius; z <= radius; z++) if (blocktype == material) remove();
