OneulDo Puzzle - Sudoku, Logic

Sudoku, nonogram, block escape, color zones, block fill and sliding puzzles. Six brain puzzles in one app. Every puzzle has exactly one solution and can be solved by logic alone, without guessing. No ads. Works offline, and signing in is optional.

The app is currently in Korean.

SIX PUZZLES

• Sudoku: from a 6x6 mini board to Easy, Medium, Hard and Expert. Difficulty is set by the solving techniques each board needs.
• Nonogram (picross): paint cells by the row and column clues to reveal a picture.
• Block escape: slide blocks to clear a path for the dark target block. Try for the fewest moves.
• Color zones: place one dot in every row, column and color zone.
• Block fill: cover the board with the given pieces, no gaps.
• Sliding: slide the number tiles into order from 1.

LEVELS AND DIFFICULTY

• Choose Easy, Medium or Hard for each puzzle and the levels keep going.
• Earn 1 to 3 stars per level. Unfinished boards are saved.

HINTS THAT TEACH

• A hint first highlights where to look and explains why. Tap again and it makes the move for you.
• Hard Sudoku hints show techniques such as pointing pairs, naked pairs and X-Wing on the board.

TODAY'S PUZZLE

• Three new puzzles every day, the same for everyone. Solve all three to keep your streak.
• Share your result without the answers.

SIGN-IN AND RANKINGS (OPTIONAL)

• Sign in with Kakao, Apple, Google or email to back up your progress and continue on other devices.
• The Ranking tab shows today's, this week's and this month's rankings for each puzzle, ordered by the highest difficulty and level cleared. Today's Puzzle is ranked by the total time for all three puzzles.
• You can hide your nickname on the ranking.

YOUR RECORDS

• Times, personal bests and a streak calendar.

Without signing in, records stay on this device. When signed in, your email and puzzle records are kept with your account. Privacy policy: https://oneuldopuzzle.smartinfol.com/privacy Contact: support@smartinfol.com