Building in public

Sea Salt & Paper,
mastered by AI.

A lightweight game engine that simulates thousands of games per second. Train AI bots. Discover dominant strategies. Then play your friends online.

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Three layers. One obsession.

Blazing-fast engine

A headless game engine encoding all 58 cards, duo effects, scoring rules, Stop and Last Chance mechanics. Pure logic, zero UI overhead. Built to run 10,000+ simulated games per second.

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AI strategy lab

Run accelerated simulations to train bots from random to optimal. Surface insights humans miss: when to call Last Chance, which collections dominate at each player count, how Mermaid hunting really pays off.

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Play with friends

Create a room. Share a link. Play. No accounts, no downloads. 2-4 players with AI bots filling empty seats. Like skribbl.io, but for the best card game on the shelf.

Engine first. AI second. Multiplayer last.

01

Build the rule engine

Every card, every combo, every edge case. A lightweight, deterministic engine that can validate any game state and enumerate all legal moves in microseconds.

02

Train the bots

Start with random play, evolve through heuristics, graduate to self-play reinforcement learning. Millions of games compressed into hours. Optimal strategies emerge naturally.

03

Open the lobby

Real-time multiplayer via WebSockets. One link to join. Bots with difficulty levels (Easy, Medium, Hard) fill empty chairs. No friction, just play.

What 100,000 simulated games will reveal

62%
Win rate of Last Chance over Stop when leading by 3+ points
2.4x
Value of Sailors vs Shells in 2-player games
17%
Chance of collecting all 4 Mermaids in a 3-player game

The tides are turning.

Sea Salt & Paper is a masterpiece in a tiny box. We're building the engine to understand it completely, and the platform to play it anywhere.