This is a Four Cells puzzle, an area-dividing puzzle.

Rules of Four Cells:

  • The grid is to be divided along the grid lines into areas containing exactly four cells.
  • A number in a cell indicates how many of its four sides are segments of area boundaries. Note that this also includes the border of the grid.
  • Line segments of area boundaries should not be left dangling. (See below for an example)
  • An area may contain any multiple number cells (including none).

An example grid is shown below for greater clarity.

Example puzzle:


Solution to example puzzle:


The example below showcases dangling ends and is an incorrect solution to the puzzle.


Shown below is the actual puzzle to solve:


Good luck and have fun!

  • 1
    $\begingroup$ (For what it's worth, I usually see it translated just as Four Cells, not the romanized Japanese version. Still looks like a neat puzzle though!) $\endgroup$
    – Deusovi
    Commented Nov 15, 2020 at 11:37
  • 2
    $\begingroup$ This is also known as Palisade in Simon Tatham's collection. $\endgroup$ Commented Nov 15, 2020 at 11:47
  • $\begingroup$ Corrected Game ID 6x6n4:2b1i23a1m2b3 $\endgroup$ Commented Nov 15, 2020 at 12:04

1 Answer 1


Some basic deductions:

enter image description here

Next, look at

the 3 in the center. It must be a "dead end" of a region; if it goes up, then it must go left then, and we have a problem -- we can't make the fourth cell without running into the top 2's region!
So the 3 doesn't go up, and R2C3 is a dead end. Making sure to keep regions of size 4, we get to here:
enter image description here

Now let's look at possibilities for another clue:

specifically, the 1 on the right. It has to be the middle cell of a T tetromino; if the tetromino is oriented as ⊥, ⊤, or ⊢, it will cut off the upper right corner. So it must be a ⊣.
enter image description here

And finally,

if the 3 region goes down and connects to the two cells below it, the cell in R6C3 will be blocked off. So it must make an S tetromino instead, and this completes the puzzle!
enter image description here

  • $\begingroup$ nooooo i just finished my write-up :'( heheheh $\endgroup$
    – oAlt
    Commented Nov 15, 2020 at 12:08

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.