Factorio Forums

Playing around with concrete in sandbox mode, and I found that if I place concrete such that it is entirely surrounded by grass, removing the concrete creates water tiles beneath.

Also: When you happen to stand on such a tile you break the game: Your character and inventory disappear.

It seems like the function to change a tile is still somewhat broken, I remember having similar troubles when I made the landfill mod about a year ago.

You also cover small areas of water with concrete floors by placing the flooring all around it. Then when you remove it, sometimes the water comes back and sometimes it does not.