psudo resursive

int blocks [width, height]

flexible[] coord stack

clickblock (x, y)
{
	stack.push_back(x, y)//thefirst block
	
	col = blocks[x,y]
	
	while  (!done)
	{
		done = checkblock(coords.end().x, coords.end().y, col)
	}
}

bool checkblock(x, y, col)
{
	blocks[x, y] = 0
	for (each block bl around x/y in blocks)
	{
		if (bl == col)
		{
			stack.pushback(x of bl, y of bl)//reset the 
			return 0//it's not done
		}
	}
	stack.popback()//remove the last of the stack, continue checking the block below
	
	return stack.size()
}