Sudoku Daily & Killer: Tidoku

Tidoku is a calm offline sudoku game that teaches you to solve: Classic, Killer, Jigsaw and Diagonal sudoku from Easy to Extreme, plus a daily puzzle, every one solved by logic and never by guessing. Hints name the technique and light the cells that prove it, and one-minute lessons teach 31 sudoku techniques. Most sudoku apps only reveal a digit when you ask for a hint; Tidoku explains why, so you stop needing hints.

Learn sudoku techniques
The Tide Chart lists 31 sudoku techniques, from Naked Single and Hidden Single up to Skyscraper, XYZ-Wing, W-Wing, Swordfish and Jellyfish, plus the Rule of 45 for Killer. Each technique has a one-minute sudoku tutorial, and most have practice puzzles built to need it.

Sudoku hints that name the technique
Nudge shows where to look and never costs a coin. Explain names the technique, walks you through it step by step with colour-coded words, and lights the cells that prove it: no cost on Easy, Medium or in lessons, three a day from Hard up, then coins. Place writes the digit. A hint never just says "try and see", even on Extreme. These sudoku hints teach, so you stop needing them.

Spotted: sudoku that sees how you solve
• Place a digit no single could give you, with no hint open, and Tidoku names the technique you just used: Spotted! A glass bell rings and a short voice line in English cheers.
• Spot a technique on three different puzzles and its lighthouse lights on your Tide Chart: mastered.

Sudoku for beginners, and for experts
• Six tiers, from Easy, Medium and Hard to Expert, Master and Extreme. Easy sudoku boards and one-minute lessons make Tidoku friendly sudoku for beginners.
• Every sudoku is solved by logic, never by trial and error, even on Extreme.
• Classic sudoku, Killer, Jigsaw sudoku and Diagonal sudoku boards.
• A Journey of 600 levels in 30 chapters brings in the techniques one by one.

Killer Sudoku that is easier to read
Tinted cages, a cage helper that lists the digit sets for each sum, and the Rule of 45 taught like any other technique. Easy and Medium Killer sudoku boards give more digits; harder ones give few or none.

Daily sudoku with a weekly rhythm
• The Daily Puzzle is the same sudoku for everyone: Easy on Monday, rising to Master on Saturday, Killer on Sunday. Past days wait in the calendar, and a full month wins a trophy.
• The Weekly Challenge: one hard sudoku a week. Solve it in Classic or Strict with no hints and your time goes on the Play Games leaderboard.
• Your week, in Settings: puzzles solved, solved without hints, techniques spotted and days played, with a share button.

Coins and Play Games
Coins come from solving the Daily, the Weekly, Stretch puzzles and every technique you master. Spend them on Explain hints or one more chance in Classic. Google Play Games adds achievements and cloud save.

PERFECT FOR
- A flight, train ride or queue with no Wi-Fi or signal
- A quick break, or a calm evening to wind down
- Beginners who want to learn sudoku techniques one minute at a time
- A daily sudoku habit: Easy on Monday, rising to Master on Saturday, Killer on Sunday

FAQ
Does Tidoku work offline?
Yes. Tidoku plays fully offline: no Wi-Fi and no mobile data needed.

Does Tidoku have ads, and what costs coins?
Tidoku contains ads; Remove Ads is a one-time purchase and coin packs are optional. Nudge never costs a coin. Explain costs nothing on Easy, Medium or in lessons, then three a day from Hard up before it uses coins.

Do I ever have to guess?
No. Every sudoku is solved by logic, never by trial and error, even on Extreme, and a hint never just says try and see.

Is Tidoku good for beginners?
Yes. Easy boards and one-minute lessons make it friendly for beginners, and six tiers from Easy to Extreme grow with you.

Sudoku offline
Every sudoku plays offline: the Journey, the Daily Puzzle and the Weekly Challenge come inside the game. 16 languages. Contains ads; Remove Ads is a one-time purchase. Coin packs are optional.