Harfi
It does exactly what you said. Not what you meant.
Harfi launched on August 18, 2026 with 3 votes, #2,940 of 23,274 launches that month and more than 50% of that year's launches.
What it does
Forty trials, each a spec an AI's answer has to hit exactly — three bullets, fifty words, valid JSON, no letter O. You never write the answer, only the instruction. A parser scores it, never an opinion. Fewest strokes wins.
A game where you write the instruction, not the answer. Forty trials, each a spec an AI's output must hit exactly — checked by a parser, never by an opinion.
Not what you meant. Forty trials, each one a spec the machine's answer has to hit — exact bullet counts, hard word caps, forbidden letters. Get it there in as few strokes as you can. Explain a black hole in 60 words or fewer — without ever using the words gravity, light, star, space, or massive. Describe a black hole for a curious adult. Under 60 words. Banned words: gravity, light, star, space, massive. Check every word before you answer. Every trial hands you a set of rules the answer must satisfy. Exactly three bullets. Sixty words, hard cap. Five words you may not use. You never write the answer. You write the instruction that makes the machine produce it — in 120 words or fewer.…from harfi.games
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