I can't figure out what the correct output should be here... I have correctly deciphered the message and have saved it in the solution variable, but the test case isn't passing... I tried both the whole message and only the actual safe passcode. What am I doing wrong here?

Nice kata, but I think it should be at least 4-5 kyu...

Very interesting and rewarding! Much more challenging than it seemed at first - in a good way. Especially liked how the scrambled message changed each time so you had to figure out the encryption.

I think it used to be 4, but for some reason, someone changed it to 6 a few days ago.

Agreed

I would've rated this kata as a 4 kyu.

Some people might get really frustrated when they see a 6 kyu and can't solve, wondering wtf

Thank you! Had to find a way to make it interesting and not having just one single answer. :)

Thank you!

Nice Kata. Congratulations!

I think the pre-code is more than clear:

// this is your solution string (for example: "123")
var solution = ""; 

But if this kata gets more attention, I'll see if I can improve it even further.
Thank you

Setting the solution variable to the solution is non-standard. I think it would be better to call Safe.open(solution) at the end or properly explain that setting solution is all that is required.

Thanks, glad you had fun with it!

That was fun, well done!