XuDoKu is a beautifully minimal Sudoku that respects your brain and your privacy: every
puzzle is generated on your device, guaranteed to have exactly ONE solution, and graded by
the same logical techniques a human solver would use — no brute-force boards, no guessing.

PUZZLES THAT ARE ACTUALLY FAIR
• Every board is provably unique — generated, verified, then shipped
• Difficulty is graded by a human technique ladder (naked singles → X-Wing), not just by
counting givens — an Easy board is genuinely easy, an Expert board genuinely hard
• Four grid sizes: 4×4, 6×6, 9×9 and a first-class 12×12 with hex symbols A, B, C

PLAY AT YOUR PACE
• Clean timer with a fair 30-second pause allowance — no hiding the board to steal your time
• Tournament clock for purists: the clock runs end to end
• Hardcore mode: three mistakes and the game is over

EARN YOUR EDGE
• Time-and-difficulty scoring pays coins for every finished board
• Spend coins on hints: check your errors, highlight the next logical step, reveal a cell,
or (for pride's surrender) solve the board
• Stars for fast, clean solves — a flawless, hint-free board pays a 25% bonus
• Daily Challenge: one date-seeded puzzle, identical for every player worldwide, rotating
through grid sizes and difficulties each weekday — keep your streak alive for bonus coins

MADE TO BE CALM
• Ink-and-white design that inverts perfectly between light and dark mode
• Gentle haptics on conflicts; completed rows, boxes and columns flash green
• Instant offline generation — even a 12×12 board appears in well under a second

COMPLETELY PRIVATE
• No internet permission. XuDoKu cannot send a single byte anywhere — it is offline by
design, not by setting. No accounts, no ads, no tracking, no data collected.

Whether you have four minutes on a coffee break (4×4) or a long evening (12×12 Expert),
XuDoKu generates a fresh, fair, solvable board every single time.