Sto-stone is a puzzle made by Nikoli. Here are the rules:
- You must color the cells with black with the following rules:
- There are rooms enclosed in bold lines. The number on the room shows the number of continuous black cells in that room. No number means any number of black cells.
- Black cells cannot connect across bold lines, vertically or horizontally.
- Stones (or the black cells) must be dropped straight down, and the stones must fill the bottom half of the grid without empty cells. (Dropped stones may cross and connect across bold lines)
(Example in the link above)
This is your real challenge: