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Inspiration

Everyone thinks they can read a chart. We wanted a game that tests it honestly: no money, no trading, just your eye against real market history.

What it does

Real or fake? A real historical price chart splits into two endings. One really happened; the other was generated to look believable. Pick the real one: right answers pay chips and build a streak.
Draw it: draw where the price went next. You're scored on how close your line comes to history, and you have to beat the flat line.
Tables: sit with friends or computer "regulars" (always labelled as computer players). Every seat plays the same charts; the best reads split the prize.
Daily fork: the same 10 charts for everyone, once a day, with a leaderboard.
Learn: two short lessons for people who have never seen a chart. Then Wick, a living-candle mascot, points once at each new thing as it unlocks.
1,260 real charts from 44 US stocks and cryptocurrencies, in six languages (English, Turkish, Spanish, German, French, Portuguese).

Chips are virtual play money: they can't be cashed out, sold or sent to other players. Everything is free to play, and a chest refills free chips every 6 hours.

How we built it

Expo / React Native + TypeScript: one codebase for iPhone and the web demo, with EAS over-the-air updates.
Firebase: Auth (guest, then Sign in with Apple or Google), Firestore for boards and live tables, Cloud Functions for purchases.
RevenueCat powers the chip store: four consumable packs served from an Offering and bought with the RevenueCat SDK. A RevenueCat webhook calls a Cloud Function that credits chips into a private, idempotent ledger (each store transaction credits exactly once). A claim fallback asks RevenueCat's API for anything the webhook missed. Sandbox purchases are capped for TestFlight, a signed-in player's first purchase is doubled, and a guest's purchases move to their account when they sign in.
A Python pipeline builds the chart bank. We tuned the fake endings against a classifier until it could barely tell them apart (from 98.5% to 64% accuracy).

Challenges we ran into

Making fakes hard to spot without making them unfair: wicks and gaps were the giveaway.
Consumables can't be restored, so every purchase is credited on the server and is recoverable ("Check for missing chips").
Balancing the economy: free chips generous enough to play forever, while packs still mean something.
Teaching people who have never seen a price chart.

Accomplishments that we're proud of

A game where skill really shows: every seat plays the same charts, and nothing random decides your own result.
Purchases that never lose chips: webhook, claim and ledger together.
A warm casual design with a mascot, in six languages.

What we learned

Teach by playing: our first tutorial was 16 questions; a timed walkthrough and research cut it to 8.
Point once, then get out of the way: Wick shows each new feature a single time.