Firebase Setup

This game uses Firebase Realtime Database for live sync. The free Spark plan handles hundreds of concurrent games.

1
Go to console.firebase.google.com → Add project → any name → disable Analytics → Create project.
2
Sidebar: Build → Realtime Database → Create Database → any location → Start in test mode → Enable.
3
Project Settings (gear icon) → scroll to Your apps → </> Web → register → copy the firebaseConfig object.
4
Open this HTML in any text editor → find FIREBASE_CONFIG near the top → paste your values. Ensure databaseURL ends with .firebaseio.com.

How to Play

Multiplayer Online

  1. Enter name, choose player count, click Create Room.
  2. Share the 5-letter code with friends — each enters it to join.
  3. Game starts when all human seats are filled.

vs Computer

  1. Select 1 Human + any number of AI opponents.
  2. Choose difficulty, then Play vs AI →.

Rules

  1. Take turns drawing one line between adjacent dots.
  2. Complete a box's 4th side → claim it + bonus turn.
  3. Chain multiple boxes in one turn.
  4. Most boxes when board is full wins.

Dots & Boxes

Real-time multiplayer · Up to 4 players · vs AI

Your Name
Human Players
AI Opponents
Grid Size
or join an existing room
Join with Code
Room Code — tap to copy
XXXXX
Share with your opponents
Waiting for players