A silent-rule mind trial
See the shadow.
Name the law.
Ten chambers. Each one hides a rule you are never told. Study what is allowed. Choose what belongs. No hints. No mid-game answers. At the end, your mind is measured.
Unlike quizzes, FATHOM never names the rule. You infer it the way intelligence actually works: from pattern alone.
One instruction.
You will not be told if you are right until chamber ten closes.
Study the allowed set
Three examples already follow a hidden law. Colors, counts, positions, and shapes may all be the law — or clever noise.
Pick the one that belongs
Four candidates. Only one obeys the same unspoken rule. Keys 1–4 work on a keyboard.
Receive your Fathom Index
After all ten, speed, accuracy, and which kinds of law you saw are distilled into an IQ estimate.
Chamber I
Which also follows the rule?
These follow the unspoken rule
Which also follows?
Your Fathom Index
A playful estimate from silent-rule inference, speed, and consistency — not a clinical IQ test.
Chamber review
