Nice kata

All Diagonals! It was hard to undestand for me.

123
456
789

x - elements on diagonal

 0 Diagonal     I Diagonal    II Diagonal    III Diagonal    Last Diagonal
 
  1 2 3             1 2 3         1 2 x          1 x 3           x 2 3
  4 5 6             4 5 x         4 x 6          x 5 6           4 5 6
  7 8 x             7 x 9         x 8 9          7 8 9           7 8 9

I spent 15 minutes trying to understand how the part with '\n1'.join(... works. It was much easier than I thought.

And the whole problem was that wrapping the box through different sides...

If you got 174 on the first test. You need to pass the tape along the long sides of the box

This one:

  +--------+
  /____/___/|
 /    /   /||
+--------+ ||
|    |   | ||
|    |   | |+
|    |   | /
|    |   |/
+--------+

Vs this:
  +--------+
  /   /    /|
 /   /    / |
+--------+  |
|    |   | /|
|____|___|/ +
|    |   | /
|    |   |/
+--------+

Or other one

There you go!

Wow

WOW!