HEAD-TO-HEAD · SAME PUZZLE · FASTEST WINS
Arena.
Same puzzle. Different brain. Send the link and find out who actually thinks faster.
WHAT A CHALLENGE LOOKS LIKE
@midnight_solver
SENT YOU A CHALLENGE
SUDOKU · T3 · MEDIUM
9×9 · Standard rules
Same seed, same board. Solve it before they see your time.
THEIR TIME
4:38
Can you beat that?
RESULT
YOU
4:12
vs
THEM
4:38
YOU WON BY 26 SECONDS
They can't see your time until they finish. No anchoring. No excuses.
HOW IT WORKS
1
Pick a puzzle
Any type, any tier. Tap CHALLENGE in the GridJoy app.
2
Solve it first
Your time becomes the bar. They can't see it until they finish.
3
Send the link
App opens the exact puzzle. No account needed to accept.
WHY IT'S FAIR
The same seed produces the same puzzle every time on every device. There's no "easier" copy. If your friend says you got a different one, the seed in the URL proves you didn't.
Sudoku duels with newspapers don't work because everyone gets a different puzzle. Arena fixes that. Same constraint, same logic, same target. Whoever solves first actually solved first.
RECEIVED A CHALLENGE LINK?
Tap it. If GridJoy is installed, the app opens the exact puzzle. If not, the browser shows an install button — the puzzle loads automatically once you're in. Your rival is already waiting.
EXPLORE THE WORLD
START A CHALLENGE — FREE ON ANDROID
FREE ON GOOGLE PLAY →Challenge all 18 puzzle types. Ghost profile. Streak. No paywalls.