Sudoku-Daily Sudoku Challenge

Stuck? Hints name the technique and frame the area — you crack it yourself. Photo-import any puzzle for an instant rating and a fully explained solve path. Free, no ads.

SudokuFang — the sudoku that explains every step. Stuck? Hints don't spoil: they name the technique, frame the area, and reveal layer by layer until you crack it yourself. Found a hard puzzle in a book or online? Photo-import it for an instant rating and a fully explained solve path.

[Hints That Teach] Five layers of reveal: technique → area → candidates → eliminations → full explanation. Each layer tells you a little more; the answer stays yours to find. Every hint links to the technique's full lesson — learn as you play.

[Any Standard Sudoku, Explained] Import by camera, by hand, or by paste: · Checks for no solution, a unique solution, or multiple solutions · Rates difficulty (ER + score) with a technique breakdown · Generates a complete solve path — every placement and elimination justified · Explore alternative moves at any step, or long-press a candidate to test a hypothesis · Export your solve as a GIF, a long image or a difficulty report

[70+ Techniques, Taught Properly] From basic eliminations and pairs to chains, fish and beyond — each with theory and worked examples. Five theory courses read like an illustrated textbook; the learning path mirrors the seven game difficulties, and what you learn shows up in your next hint. Generate practice puzzles that target any technique.

[A Fresh Goal Every Day] · Daily Challenge: the same puzzle worldwide, medal calendar, same-month make-up days · Library campaign: seven difficulty tiers, plus your own collections · Score leaderboards and head-to-head races on the same puzzle (online)

[New Rules, New Fun] 20 sudoku variants: Killer, Diagonal, Jigsaw, Windoku, Thermo, Kropki, Sandwich, Skyscrapers and more — each with four difficulty levels, full notes, annotations and highlighting.

[The Small Things] Auto-candidates, 10-color annotations, chain drawing, solve replay, 14 themes, dark mode, iCloud sync.

No ads. Open the app, and it's just sudoku. Whether it's your first puzzle or you're deep into chains and fish, SudokuFang is here to explain the next step.