Grumpy Gramps Sudoku

Sudoku from a grumpy old man who's tired of games that treat you like a mark.

No ads. No subscriptions. No timers nagging you back. No data collected — the app can't even reach the internet. Pay once and it's yours.

EVERY PUZZLE HAS EXACTLY ONE SOLUTION
Every grid is verified to have one answer and only one. No broken puzzles, no guessing.

HONEST DIFFICULTY
Five tiers, from Casual to Expert, graded by the techniques each puzzle actually requires — not by how many numbers are missing.

LEARN THE HARD STUFF
A strategy library explains every technique the harder grids will ask of you, from naked singles to swordfish, each with a real example. Nobody is born knowing a swordfish.

A DAILY PUZZLE
A new one every day, the same for everyone. Keep a streak if you like. Miss a day and nothing bad happens.

SHARE A PUZZLE
Send a friend a code and they play the exact same grid.

TROPHIES THAT MEAN SOMETHING
Five rungs on every ladder. Finishing 500 Hard puzzles gets you more than a participation ribbon.

YOUR SETTINGS, YOUR WAY
Mistake checking, pencil notes, hints, Gramps's commentary — all of it can be switched off.

Works on airplanes, in basements, at your in-laws'. No signal required.

No ads. Nothing collected. Works offline.