I don't understand why does solution require adding an extra day.

It would help if there was a hint about digits in description instead of tests

The description doesn't say anything about unknown players and has no sample tests for it. I made a fork that fixes that.

I got a bit stuck on false positives. There should be a test which checks if the last element in array is checked, like:

test.assert_equals(max_sequence([3, -1, 6]), 8)

Also, there is not a single example with arrays consisting of negatives. A couple of tests like this might check that:

test.assert_equals(max_sequence([-2, -3]), 0)

You imported a module, boo

Spacing in first solution is inconsistent, making it hard to read
https://github.com/airbnb/javascript#whitespace
Anyway. That's not the point. This kata doesn't have to use loops because it's solvable through sorting. Maybe you should drop initial code entirely, and leave only function declaration?

Message in third test case for Ruby is wrong:

  it "should find these numbers are NOT narcissistic" do
    Test.assert_equals(narcissistic?( 1633 ), false, "153 is narcissistic")
    # Correct:
    # Test.assert_equals(narcissistic?( 1633 ), false, "1633 is not narcissistic")
  end