Four games, four kinds of duel
| Game | What wins | Can you beat the computer? | Best for |
|---|---|---|---|
| Checkers, English or Russian | Capture or block every piece | On Easy and Medium, yes. Hard is a real fight | A long game of planning |
| Four in a Row | Four discs in a line | Not Perfect when it moves first | Reading threats before they land |
| Tic-Tac-Toe, 3×3 | Three in a row | No. A draw is the best result | Proving you don't make mistakes |
| Tic-Tac-Toe, 4×4 and 5×5 | Four in a row | Yes, it can be beaten | Quick tactics |
| Rock Paper Scissors | Out-guessing the other side | Only by luck: it picks at random | Reading a friend |
Play a friend in two clicks
Choose Play with a friend, enter your name and create a room. Copy the link and send it however you like. Your friend opens it in their own browser, on any device, and takes the second seat. No account and nothing to install.
A room lasts 24 hours and has exactly two seats. If either of you refreshes or loses connection, come back in the same browser and your seat is still yours. When a round ends, both players accept Rematch to go again, and the match score keeps count.
Or play the computer
The computer is always ready, and each game sets it a different challenge. In checkers you choose English or Russian rules and Easy, Medium or Hard. In Four in a Row, Perfect knows the outcome of every position and never loses when it moves first. On the classic 3×3 Tic-Tac-Toe board it plays perfectly, so the best you can do is a draw. In Rock Paper Scissors it picks at random, which makes it impossible to read. A friend is a different story.
Frequently asked questions
Do both players need an account?
No. Neither player needs to sign in. The room link is all your friend needs.
Can we play on different devices?
Yes. One of you can be on a phone and the other on a laptop. Each player plays from their own browser.
How long does a room stay open?
24 hours. Return in the same browser to get your seat back after a refresh or a lost connection.
Who goes first?
X starts Tic-Tac-Toe, red starts Four in a Row and English checkers, and white starts Russian checkers. After that the first move alternates with every rematch, so neither player keeps the advantage. That matters most in Four in a Row, where the first player can always win with perfect play.
Can I challenge a friend at solitaire or sudoku?
Yes, in FreeCell and Classic Sudoku. Win without using a hint, then choose Challenge a friend: your friend gets the same deal or puzzle, and the faster time wins.
Which duel game is the hardest?
Checkers on Hard, for most players, and Russian rules on Hard most of all. A game can run for dozens of moves, and one loose piece is enough to lose a double jump, or a flying king.
Are duel results ranked?
No. Match scores stay inside the room or the computer game. There is no global leaderboard for duels, only the score between the two of you.