If I may suggest, please rephrase the requirements of the problem in a more streamlined way, such as: "initialize 3 arrays, an empty array, another with a nil value, and another one with two 10 integers" or something like that which makes it easier at first glance to understand the requirements.

array = [] array_1 = [nil] array_2 = [10,10]

Every time I try and run/submit my code, I get a runtime error. Help?

This lesson is complex, because it encourages a primary ruby anti-pattern :(, namely, the usage of conditionals such as though or except interior of an iterator in place of the usage of the built-in enumerables website. While I recognize it's miles meant as a mild advent, perhaps a lesson which does now not encompass an iterator would be superior?

You likely want to feature 'go back' at the begin, which may be very confusing, since none of the opposite function on this page.