How do I figure out the rule?

Look at the relationship between the inputs and outputs. Does the box add 1? Does it reverse the string? Does it change the gender of an emoji? Use every example to confirm your theory.

What kind of rules are there?

Rules can be mathematical (increment, double), string-based (reverse, length, uppercase), or emoji-based (gender swap, color swap, species swap).

Why do I have to insert every input?

Seeing more examples helps you distinguish between similar rules and confirms the logic behind the transformation before you commit to an answer.

Black Box · 한국어 | PlayMemorize

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