What it is
KyuSin — project label Project Sinners — is a desktop app holding many light games in one retro-terminal shell: a phosphor theme, a faint CRT effect whose intensity can be adjusted, and a boot sequence. Everything runs locally: no account, no internet, no ads, and no purchases. The interface is available in Indonesian and English, and translation completeness is checked in CI.
The main way to play is visual: dragging pieces, clicking cards, placing
chips on the table. A text-command mode (e2e4, hit, bet 50) is there
for those who like it, but it is never required. Behind the scenes, every
visual action is translated into the same action as a text command — and that
action is what other players over LAN, and AI agents, will later send.
The big plan
Three end goals, in order:
- Singleplayer. Every game can be played against a bot or dealer, with tutorials, ratings, and chips.
- Multiplayer without internet. Playing together over the same local network (LAN/Wi-Fi).
- Playing together with Project Nor-4. A local AI agent joins as a player through the same protocol as LAN players.
Right now the work is still on the road to the first goal.
What is done
As of M6a (9 October 2026), 26 games meet the Definition of Done: rules and tests, bots, visuals, text commands, an interactive tutorial guarded by automated tests, replays, and a manifest.
| Group | Games |
|---|---|
| Board | Reversi, Chess |
| Cards against the dealer | Blackjack, Baccarat, Dragon Tiger, Casino War, Red Dog, Andar Bahar, Three Card Poker, Caribbean Stud, Casino Hold’em, Let It Ride, Pai Gow Poker |
| Cards between players (against bots) | Texas Hold’em, Omaha, Teen Patti, Capsa Susun, Domino QiuQiu |
| Dice, wheels, tiles | European Roulette, American Roulette, Craps, Sic Bo, Big Six, Fan-Tan, Pai Gow tiles, Chuck-a-luck |
Chess has six levels calibrated against Stockfish 19 — Stockfish is only used as a measuring tool on the developer’s machine and is not bundled. Local ratings use Glicko-2.
An honest casino
- Real numbers. Rules and pay tables use real casino numbers, and every casino game shows its actual RTP or house edge. The numbers are computed exactly — by enumeration or Markov chains — and then matched against simulation in CI. For Pai Gow tiles, the enumeration covers 736,281,000 deals.
- Chips can never be bought, cashed out, or transferred between players.
- Provable randomness. Every shuffle and roll comes from a seed combined from all participants. A commitment (hash) of each seed is announced before the round and all seeds are revealed afterwards, so the result can be verified and no party — including the host — can choose it. A limit that is openly acknowledged: in hidden-card games, the host app technically knows the deck order while the round is running.
- Replays of every match, because each match is just a seed plus a sequence of commands.
Next
| Milestone | Contents |
|---|---|
| M6b | Keno, Bingo, scratch cards, Hi-Lo, Video Poker |
| M7 | Casino arcade, with a contract for games that run on time |
| M8 | The remaining non-casino board and card games, including Gaple, Cangkulan, and Remi — end goal 1 |
| M9 | LAN: host and join, automatic discovery, lobby, provably fair across the network — end goal 2 |
| M10 | Agent protocol and a test agent — end goal 3, without waiting for Nor-4 |
| M11 | Windows installer and Linux .deb package from CI, a third-party license page |
| M12 | New games as WASM cartridges, without rebuilding the app |
There is no installer file yet; that only arrives in M11.