Black Box
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About Black Box
Black Box is an inductive reasoning game where you must deduce a hidden logic rule. You are given a fixed set of inputs; insert them into the "black box" one by one to see what comes out. Once you have seen the results, you must identify the correct rule from the multiple-choice options.
How a round works. Tap the "Insert" button to feed the next input into the box. Watch the output table update. Once every example is revealed, four possible rules appear · pick the one that explains every transformation.
Diverse rules. Rules range from simple arithmetic (like doubling a number) to string manipulations (reversing a word) and even emoji-based logic (swapping species or gender).
Part of PlayMemorize, a passion project from Christoffer De Geer. It runs entirely in your browser.
FAQ
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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.