Hi,
You probably seen the game I’m developing and the million and one questions I keep asking and get some superb answers to (thanks all 
), one more question to add to my
list is best way or a way of when player digs out a brick that has water below, allow water to fall down, basically blocks of water to fall, kind of move and replace.
W
WW
BBBBB
BBBBB
Moving out a B would give:
WW
BBWB
BBBB
If you get what I mean? Is this some sort of flood fill? I did use flood fill to fill my caves with water tiles in my game.
Thanks