SumDoku — Daily Killer Sudoku

SumDoku is Killer Sudoku with a daily rhythm. Every midnight a fresh 9×9 puzzle appears — classic Sudoku rules plus cages: dotted groups of cells that must add up to their little number, with no repeated digits inside a cage. One puzzle a day, matched to your level. Solve it over coffee, keep the streak alive, come back tomorrow.

HOW IT PLAYS
• Tap a cell, tap a digit. Correct digits lock in; mistakes stay erasable.
• Notes mode for pencil marks, with optional auto-notes.
• A gentle hint budget when you're stuck — never a spoiler wall.
• The mascot cheers you on (and can be turned off in Settings).

ONE PUZZLE A DAY, AT YOUR LEVEL
SumDoku matches you to one of five tiers, from Apprentice to Master, and promotes you as you improve. New to Killer Sudoku? A short guided intro teaches cages in a few minutes. Sudoku veteran? Skip straight in.

THE WEEKLY CHALLENGE
Every Monday a 3-puzzle challenge set arrives for your tier — W1, W2, W3 — unlocking through the week, with a weekly leaderboard for bragging rights.

STREAKS THAT RESPECT YOUR LIFE
Daily solves build a streak, and streak freezes bank up automatically so one busy day doesn't erase your run. Stats track your averages, personal bests, and flawless solves per difficulty.

WHAT WE PROMISE
• No ads. Not now, not ever.
• No account required — progress saves automatically, and you can sign in with a simple email code to sync across devices.
• No notifications you didn't ask for. The optional daily reminder is the entire notification surface.
• No location, no microphone, no camera, no analytics SDKs. Read the full privacy policy from Settings.

FREE VS PREMIUM
Free covers the heart of the game forever: today's daily puzzle and this week's full challenge set. Premium (Fat Mika Pro, a one-time purchase — no subscription) unlocks the complete archive — every past daily and weekly puzzle, at every tier, with unlimited hints on archive puzzles.

Fat Mika Pro is shared across the FatMika puzzle family: one purchase also unlocks premium in NonoPix (daily nonograms). If you're already Pro in NonoPix, you're Pro here too — just sign in.

FOR PEOPLE WHO LIKE
• The daily ritual of Wordle, Connections, or a morning crossword
• Classic Sudoku, looking for the next step up in deduction
• Picross / nonogram-style "one more line" logic

Every puzzle is generated offline, verified to have exactly one solution, and difficulty-checked before it ships. Built by FatMika Games, the team behind NonoPix.