A better perspective is to fix and improve the existing katas.

Okay, I dont know if you have tested that kata, but doesnt even works as intended, has a lot of complains, and its super old. I think this kata deserves to replace that one.

Duplicate of Reduce My Fraction

My apologies, I had broken something while refactoring the JavaScript tests suite. Should be good now.

I dont know Why I seen the random test cases not well formated, idk if is there something I misunderstood or the tests dont work

[
  [
    ' ', ' ', ' ',
    ' ', ' ', ' ',
    ' ', ' '
  ],
  [
    ' ', ' ', ' ',
    '♔', ' ', ' ',
    ' ', ' '
  ],
  [
    ' ', ' ', ' ',
    ' ', ' ', ' ',
    ' ', ' '
  ],
  [ ' ', ' ', ' ', ' ', ' ', [ '♛', '♜', '♝', '♞', '♟' ], ' ', ' ' ],
  [
    ' ', ' ', ' ',
    ' ', ' ', ' ',
    ' ', ' '
  ],
  [ ' ', [ '♛', '♜', '♝', '♞', '♟' ], ' ', ' ', ' ', ' ', ' ', ' ' ],
  [
    ' ', ' ', ' ',
    ' ', ' ', ' ',
    ' ', ' '
  ],
  [
    ' ', ' ', ' ',
    ' ', ' ', ' ',
    ' ', ' '
  ]
]

Sometimes, it has arrays into the arrays, like, 3 dimensional instead of two, Idk if this a Kata problem or what

I would expect something like

[
			[' ', ' ', ' ', ' ', ' ', ' ', ' ', ' '],
			[' ', ' ', ' ', ' ', ' ', ' ', ' ', ' '],
			[' ', ' ', ' ', ' ', ' ', ' ', ' ', ' '],
			[' ', ' ', ' ', ' ', ' ', ' ', ' ', ' '],
			[' ', ' ', ' ', '♟', ' ', ' ', ' ', ' '],
			[' ', ' ', '♔', ' ', ' ', ' ', ' ', ' '],
			[' ', ' ', ' ', ' ', ' ', ' ', ' ', ' '],
			[' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ']
	]

but instead is something like

[
			[' ', ' ', ' ', ' ', ' ', ' ', ' ', ' '],
			[' ', ' ', ' ', ' ', ' ', ' ', ' ', ' '],
			[' ', ' ', ' ', ' ', ' ', ' ', ' ', ' '],
			[' ', ' ', ' ', ' ', ' ', ' ', ' ', ' '],
			[' ', [' ', ' ', '♟'], ' ', ' ', ' ', ' '],
			[' ', ' ', '♔', ' ', ' ', ' ', ' ', ' '],
			[' ', ' ', ' ', ' ', ' ', ' ', ' ', ' '],
			[' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ']
	]

Why?

Genius

yeah, same here, how is it possible? can even be completed this kata?

Outstanding!

I passed all attempts except the fourth :(, does anyone know what this test is? I would like to know where is my problem.

“and each of the nine 3x3 sub-grids (also known as blocks) contain all of the digits from 1 to 9.”

The problem is you're mutating the input.