第2話

Chapter 2: Pinalty

“Five Pins, One Thousand Points”

A daily football geography game. Place five pins on a world map and score up to 1,000.

LIVELaunched September 29, 2026
Visit pinalty.app

BRYAN

Trivia you forget in a second

The problem

I know where every stadium is. Let me prove it in sixty seconds, before my coffee's done.

A football fan

Most football trivia is multiple choice. Pinalty asks you to place a penalty spot on the world map, then scores you by distance from the real stadium.

How it works

  1. Step 1: Same five

    Every player gets the same five questions each day. One play per puzzle, one guess per question.

  2. Step 2: Pin it

    Place your guess on a MapLibre world map. The closer you are to the real stadium, the more of the 200 points per question you keep.

  3. Step 3: Compare

    A round takes 60 to 90 seconds on a phone. Share the score and see who knows the game better.

Behind the ink

How it's built, and how the AI is kept honest.

AI on a short leash

Code picks five verified, sourced facts. GPT-5-mini only writes the question wording, with strict JSON-schema output and provider storage turned off.

Automated checks

Output is rejected if it leaks the answer, uses numbers that aren't in the source, repeats earlier wording, or is malformed. Publishing is all-or-nothing in one database function, with a scheduled backup retry.

Answers stay on the server

Scoring runs in Postgres functions, direct writes are blocked by Row-Level Security, and secrets never reach the browser.

Built withNext.js 15 · React 19 · TypeScript · Tailwind 4 · MapLibre GL · Supabase · Vercel AI Gateway