Good Sudoku review

Good Sudoku is the pick for players who want to go deeper than classic apps allow. Zach Gage and Jack Schlesinger wrote their own generator for over 70,000 puzzles at 5 difficulty levels, and the hardest require techniques such as XYZ Wings, Jellyfish and Swordfish. The solver runs while you play, reads your answers and notes, and when you are stuck suggests the technique you need next. Each difficulty lists the techniques it requires, and you can practice them outside of puzzles. There are three standard modes, Good, Arcade and Eternal, plus 3 daily modes that get harder through the week and come with global leaderboards. A Custom mode lets you import a puzzle from paper and share it. Optional tools reduce counting, which some purists may not want. The app is free to download, and the full game is a one-time $4.99 purchase. We compared documented features and published prices only.

Who it is for

Experienced or ambitious solvers who want hard puzzles, technique training and daily leaderboards.

Price

Free to download; the full game is a one-time $4.99 purchase on the US App Store.

Full Game Unlock $4.99
Quoted from the vendor pricing page on November 10, 2026.

Key features

• Over 70,000 generated puzzles across 5 difficulty levels
• AI hint system that reads your notes and suggests the next technique
• 3 daily puzzle modes with global leaderboards
• Good, Arcade and Eternal standard modes
• Custom mode to import and share your own puzzles

Strengths and weaknesses

• Strength: States exactly which techniques each difficulty needs
• Strength: Hardest puzzles require advanced techniques such as Swordfish
• Strength: Optional tools cut the counting busywork
• Weakness: Full game needs a $4.99 purchase
• Weakness: Busywork tools may feel like help to purists
• Weakness: Fewer ratings than the big free apps

Key facts

• Developer: Zach Gage (seller STFJ LLC)
• Puzzles: 70,000+
• Paid option: Full game purchase, $4.99 one-time
• Runs on: iPhone, iPad, Apple silicon Mac, Apple Vision Pro

Where it ranks

Good Sudoku is No. 4 in our Best Free Sudoku Games verdict.