Sudoku Lite Version vs Tetsudoku

Sudoku — A refined puzzle experience built for iOS. Four handcrafted themes, four difficulty levels, and a Daily Challenge that syncs worldwide. Pure logic, zero clutter. FEATURES • Four difficulties: Easy, Medium, Hard, Expert • Daily Challenge — same puzzle for everyone, build your streak • Notes mode — jot candidate digits in warm amber; always visible at a glance • Fill Candidates — reveal legal candidates for every cell in soft gray, distinct from your handwritten notes • Number-first mode — pick a digit, then tap cells to fill them quickly • Hints — step-by-step reasoning nudges when you're stuck • Verify — instantly check for any incorrect entries • Auto-save — leave any time and resume right where you left off DESIGN • Four themes: Paper Dawn · Indigo Drift · Grid Geometric · Midnight Cyan • Icon toolbar with per-button accent colors — clean and intuitive • Adaptive layout for all iPhone and iPad screen sizes • Game Center leaderboards and achievements LANGUAGES English / 繁體中文 / 简体中文 / 日本語 / 한국어

Every Sudoku has a logical path to the end. Tetsudoku teaches you to find it. Four new puzzles arrive each morning, one per difficulty: Easy, Medium, Hard, and Expert. Twenty more come each week. The archive holds every past puzzle, ready to revisit. Stuck on a move? Most apps hand you the answer. Tetsudoku shows you the next logical step, names the cells involved, and explains the strategy behind it. Head to the Learn section for fifteen solving strategies, each with a full explanation and practice puzzles. Over time, you need fewer hints. Tetsudoku tracks candidates for you. No penciling in numbers by hand: it computes every possible value for every cell automatically. Tap to highlight all cells that can hold a given digit. Find cells with exactly two candidates in one tap. Choose any combination of values and see which cells share them. Less busywork, more solving. Spotted a puzzle in the newspaper? Enter it by hand and solve it right here. Unlock Tetsudoku Unlimited to generate custom puzzles at any difficulty, any time. Stats track your best and average solve times for each difficulty, puzzles finished, and hints used. Watch yourself improve. Easy puzzles are always free. Tetsudoku Unlimited is a single one-time purchase that unlocks Medium, Hard, and Expert puzzles plus unlimited puzzle generation.