Logic puzzle grid thing

Starter puzzle

(Printable version)

(Notes on interactive Java applet: click to change the colour of a square; press 'u' to undo, or 'c' to clear the grid and start from scratch).


One paragraph summary:
You have to fill a grid with black or white cells, so that: there is one contiguous region of each colour; no 2x2 region is filled with a single colour; for each numbered cell, the number indicates how many squares of continuous colour there are along the row and the column starting at the numbered cell.

Taking that a little slower: