Best Sudoku App for Learning Techniques: From Hard to Expert

If you can finish Hard puzzles but stall on Expert, you need an app that teaches named techniques and makes you practise them, not one that fills in a cell when you are stuck. Two apps do that in a structured way. Sudoku Royale has an 88-level Journey that ends at XY-Wing, Dojo drills in 15 technique groups and a coach that builds exercises from your own games, all free. Good Sudoku lays out which techniques each level needs, lets you practise them outside puzzles, and goes further up, to Jellyfish and XYZ-Wings. Brainium Sudoku, nerByte Sudoku and Sudoku Now! have hints that explain the move.

This page is for the middle of the climb. If you are just starting, the best sudoku apps for beginners is the better read; if you already solve Extreme puzzles, see apps for advanced players.

The App Store facts

From each app's US App Store listing, checked October 26, 2026. Prices and paid items change, so check the listing before you buy.

How each app teaches

What stands between Hard and Expert

Hard puzzles in many apps fall to singles plus the occasional pair. Expert and above start to need a short list of patterns you have to recognise on sight, roughly in this order:

1. Pairs. Naked pairs and hidden pairs, which clear candidates from the rest of a unit.
2. Box and line interactions. Pointing pairs and claiming.
3. Triples. Naked and hidden triples, harder to see because no single cell shows all three digits.
4. Fish and wings. X-Wing, Swordfish and XY-Wing, then chains such as simple coloring.

The techniques by difficulty chart shows where each one usually appears. Knowing the definitions is the easy part. The hard part is spotting them in a real grid without checking every unit by hand, and that is what separates an app that teaches from one that just explains.

Sudoku Royale: learn it, drill it, then meet it in your own games

Sudoku Royale splits learning into stages. The Journey introduces one technique per chapter across 88 levels, from First Steps to XY-Wing, so the techniques arrive in order rather than all at once. The Dojo then turns each technique into short timed drills, in 15 groups from Full House and Hidden Single up to X-Wing, Swordfish, XY-Wing and Simple Colouring. Timing is the point: you are training recognition speed, which is what Expert puzzles test.

Sensei Royale closes the loop. It picks real positions from your own recent games and gives them back as practice, so you drill the spots you actually meet. A skills radar tracks Speed, Accuracy, Vision, Consistency and Repertoire, so you can see which side of your solving lags.

In Practice, the hint waits until you have gone about 90 seconds without progress, then names the technique and the cell but not the number, and links to the lesson. You still have to find the move, which is how it sticks. Practice runs from Easy to Extreme, and each higher level unlocks after a number of solves at the one below.

Notes are manual: there are no automatic pencil marks. For a learner that cuts both ways. Writing candidates yourself is slower, but it is also where you start to notice pairs and triples forming.

Good Sudoku: the deepest technique list

Good Sudoku's listing says its solver runs while you play and reads your answers and notes, so a hint can point to "the next technique you need" given what you have already found. It names the techniques each difficulty requires, lets you practise them individually outside puzzles and tracks which ones you have learned. Its hardest puzzles, per the listing, need XYZ-Wings, Hidden Quadruples, Jellyfish and Swordfish, which goes beyond Sudoku Royale's course. It also offers optional tools that cut down counting busywork. It sells Full Game Unlock $4.99. Our Sudoku Royale vs Good Sudoku page compares the two in detail.

Explanatory hints: Brainium, nerByte and Sudoku Now!

These three explain a move when you ask, without a course around it. Brainium's listing calls its hints a learning tool that shows "why" the answer is what it is, with animations and visuals; it shows ads unless you buy Remove Ads. nerByte lists "explanatory hints" with step-by-step instructions and says it is playable offline without restrictions. Sudoku Now!'s listing says its hints teach solving techniques as well as showing the next move. If you learn best by asking at the moment you are stuck, these work; they just will not tell you what to practise next.

Where another app is the better pick

• You want techniques past XY-Wing. Good Sudoku names Jellyfish, XYZ-Wing and hidden quads. Sudoku Royale's course stops at XY-Wing and Simple Colouring.
• You learn offline. Sudoku Royale's hints and the Dojo need a connection. nerByte's listing says it plays offline without restrictions.
• You want to practise finding your own mistakes. Sudoku Royale checks every number as you place it, with no way to switch that off, and has no undo.
• You want auto notes so you can focus on patterns. Good Sudoku lists busywork-reducing tools; Brainium lists Auto-Fill Notes. Sudoku Royale has neither.

Sudoku Royale is also new: it launched in 2026 and has 11 US ratings, against years of reviews for Brainium and Good Sudoku. It is iPhone and iPad only.

Our pick

For moving from Hard to Expert and Extreme with a clear plan of what to learn next, and no ads or purchases, download Sudoku Royale and work through the Journey alongside the Dojo. When you outgrow its course, Good Sudoku is the natural next step. If pairs are where you stall today, start with stuck with pairs. Every matchup is on the comparisons page.