No Turns, No Locking Each Other Out: How Co-op Sudoku Stays in Sync
Everyone in the room can fill any open cell, at any time — here's how the shared grid stays consistent without turn order.
Free to play
Free online games, built to be fun.
Juliet Games makes games you'll actually enjoy — solo or with friends and family. Play Daily Sudoku, Type Racer, Trivia, and Signal Words free in your browser, or check out Grandmaster Sudoku, coming soon to iOS and Android.
Why players get hooked
Six Grandmaster modes
Diagonal X, Time-Attack, Blindfold, Jigsaw, Killer, and Classic — each one changes the rules, not just the difficulty.
Race a friend live
Create a room, share a code, and solve the same grid head-to-head — no accounts, no waiting.
A new puzzle daily
The Puzzle of the Day resets every 24 hours — same grid for everyone, bragging rights included.
Our games
One out now, more in the works.
Puzzle
iOS
Android
Grandmaster Sudoku
Classic sudoku with six advanced variants, a daily puzzle, and live multiplayer races against friends.
From the blog
Under the hood
Play together
Team Battle: The Icebreaker Your Standup Didn't Know It Needed
No app to install, no accounts to create — just a room code, two to four teams, and a shared grid to fight over.
Under the hood
How a Grandmaster Sudoku Race Actually Works
Six players, one grid, no puzzle data sent over the network. Here's the trick.
Think you're a grandmaster?
Six ways to play, a daily puzzle, and friends to beat. Find out.