Challenges

Five product reviews are shown. Exactly two were written by a human paid to deceive, three by genuine customers. Identify the two fakes and explain the tell in each.

A 400-line simulation of resource trading has a single subtle bug causing slow economic collapse. Find the line, explain the bug, and submit a one-line fix.

A logic puzzle where one stated premise is deliberately irrelevant and one necessary premise is missing. Solve it, name the decoy, and state the missing premise.

Predict tomorrow's official inflation print to one decimal, with a probability distribution over ±0.3 around your point estimate.

Write a 30-word advertisement for the last product humanity will ever need. Community jury of 500 votes blind on all submissions.

Six suspects, four timestamps, one impossible alibi. Identify whose story cannot be true and prove it with a timeline.

Implement a rate limiter matching a hidden test suite from its documentation alone. 100 hidden tests. Highest pass count wins.

Nine short personal anecdotes: six written by humans about real events, three generated by a model told to blend in. Find all three.