EverySudoku - sudoku, puzzle

Nine digits, eighty-one cells. EverySudoku keeps things simple and puts the puzzle first.
Whether you have five minutes on the bus or half an hour before bed, there is a board waiting for you.

■ 2,000 stages across 4 levels
Easy, Normal, Hard and Very Hard — 500 stages each.
Difficulty is not judged by empty cells alone. Every puzzle was actually solved and graded by the techniques it needs (singles → locked candidates → hidden pairs and X-Wing → trial and error) together with how many numbers you start with.
Within each level, earlier stages are easier and later ones get harder.
All 2,000 puzzles are verified to have exactly one solution.

■ Daily Sudoku — a new puzzle every day, one try
Each day a new puzzle opens for every difficulty, and everyone plays the same board.
You get one try per difficulty per day. Rankings are by time, and your own rank is always pinned at the bottom of the list.
Rankings reset every day at midnight Korea time.

■ Built to be comfortable
· Notes: jot candidates in the nine spots of a cell. They hide when you place a number and come back when you erase it.
· Once all nine of a number are on the board, that key disappears, so you can see what is left at a glance.
· Wrong numbers turn red, correct ones turn blue.
· Three mistakes are allowed. The fourth ends the game, but you can watch an ad to continue once.
· Stuck? You have 3 hints, and you can watch ads for up to 2 more.
· Your stage board is saved, so you can pick up where you left off.
· Start with a 3-2-1 countdown and pause any time.

■ Start right away, no sign-up
You start as a guest the moment you open the app, and you can change your nickname any time from your profile.
Link your account with email to carry your clear records over to another device.
Stages can be played without an internet connection.

■ Good to know
· Free to play with ads (banner and rewarded). No in-app purchases.
· Available in Korean and English.
· Turn sound effects on or off in Settings, and delete your account right inside the app.

Contact: meansccf@gmail.com
Privacy policy: https://ccfsoft.com/policy/sudoku/