CDMX
A game for two phones. Same question, same 30 seconds, then both answers flip at once.
01 — The idea
Two people answer the same question about themselves at the same moment, each on their own phone. Then both answers flip over together. Same answer is a heart. A different answer is a talking point: something to talk about, never a fail.
It started as a game for couples. Then we pointed it at dating: instead of sending "hey," you send someone a game. So now there's a Discover feed, invites and chat built around the core round.
I co-founded it and designed it, and built the Expo apps, the Next.js site and the Firebase backend in one monorepo.
02 — The walkthrough
01 · Welcome
Meet Maya and Jordan. The whole game is one idea: answer the same questions about yourselves, and every match fills a heart.
02 · Play
Create a game and send the code, or join with someone else's. Not online together? Play when you're both free, and the game waits up to 48 hours.
03 · Ten questions
Same question, same moment, each on your own phone. You have 30 seconds. No peeking at theirs.
04 · The reveal
Both answers flip at once. Same answer is a heart. At the end you get your hearts, your talking points and the XP you earned together.
05 · Talking points
Different answers aren't a fail. They're the thing to talk about. React to theirs, or take it straight to chat.
06 · Chat
Talking points follow you into chat, and you can send the next round from there.
07 · Your bond
Games together, streaks, where you click and where you differ. A running score of how in sync the two of you are.
03 — What it does
Say your answer instead of tapping one. It's recorded, uploaded and transcribed with Gemini 2.5 Flash, and the timer pauses while you talk.
Netflix & Chill, Spicy Takes, Love Languages, Green Flags, First Date, Food Fights and more, plus a You + Me deck written by AI.
Not online at the same time? Each player locks in their answers on their own, and the game waits up to 48 hours for the other.
Progress is computed on the server: levels, badges, a personal streak and a streak for each pair, Duolingo-style.
English, French, Spanish and Portuguese. Answers are stored as keys, not text, so two people playing in different languages still match.
04 — In the hand
05 — Under the hood
The first version wrote an answer and then read the room. Each phone only ever saw its own answer and games got stuck. Scoring moved into a database transaction, so whichever transaction sees both answers moves the round to the reveal.
Both phones ask for the next question after the reveal, and both requests used to land. The transaction now only advances from the reveal state, so the second call does nothing. A shared state machine lists every allowed move: lobby, question, reveal, complete.
The finish time is written once inside the transaction and a database rule stops it from ever changing. A Cloud Function fires on that write and records the match, XP and streaks for both players. That replaced the host's phone saving results.
Scoring is a set of pure functions in a shared package, used by the app and the functions alike. Two timeouts are never a heart, and typed or voice answers always count as talking points.
Built with
06 — What I took from it
Realtime multiplayer is mostly about the moment two phones do the same thing at once.Get that right and the game feels like magic.
Contact
I like talking to founders early — before the deck, before the team. Tell me what you're working on.
Write to me