Kosudoku — Multiplayer Sudoku

Kosudoku is Sudoku as a live race. You and up to three friends get the identical board, and you're all filling it simultaneously — their guesses appear on your screen the moment they make them. Every square belongs to whoever solves it first. Hesitate on a cell you'd worked out, and you'll watch it turn someone else's colour.

That's the whole game: a shared grid, a running scoreboard, and the pressure of knowing three other people are looking at the same empty square you are.

Race on one board

Up to 4 players on a single shared puzzle, live.
See opponents' attempts land in real time, colour-coded by player.
Claim a square by solving it first — it's yours, and it's gone for everyone else.
Wrong guesses cost you points, so speed alone won't win it.

Build a streak, hunt the bonus cells

Chain correct answers to raise your streak multiplier.
Gold cells double your points. Rainbow cells triple them.
Land a streak on a bonus cell and the score jumps.

Play solo any time

Four difficulties, from Easy to Expert.
Chase your own best times and scores.
Every solo game still feeds your league points and rank.

Climb the leagues

Weekly league groups of up to 20 players.
Finish top three to promote — slip and you drop.
Ranks run Bronze through Grandmaster.

Put something on it

Wager Quickets on a match. Everyone matches the stake, winner takes the pool.
Earn Quickets from wins, streaks and daily rewards.
Spend them in the store on board skins, themes, fonts and player colours.

Play with friends

Add friends, see who's online, challenge them directly.
Schedule a match for later and get a reminder when it's time.
Chat in the lobby and mid-game.

Cross-platform. iPhone and Android players compete together in the same live matches, leagues and leaderboards. Challenge any friend, whatever they play on.