Sudoku by Brainium review

Sudoku by Brainium is the classic sudoku app for players who want to get better, not just get unstuck. Its Hint button gives you the technique needed to make progress, with animations and colored visuals that are unique to each puzzle, so you learn why the answer is right. There are five difficulty levels from beginner to expert and an unlimited supply of puzzles. Daily Puzzle Challenges earn points and gold checkmarks, and statistics and achievements track progress. Comfort options are strong: two grid styles, nine backdrops, adjustable font size, auto light or dark mode, portrait or sideways play with a left-handed option, and iPad keyboard support. Number Painting fills open squares fast. The free app shows ads, and Remove Ads is a one-time $11.99 purchase. It sticks to classic 9x9 sudoku, so variant fans should look elsewhere. We compared documented features and published prices only.

Who it is for

Players who want a calm classic sudoku that teaches technique when they get stuck.

Price

Free with ads; Remove Ads is $11.99 on the US App Store.

Remove Ads $11.99
Quoted from the vendor pricing page on November 10, 2026.

Key features

• Hints that explain the technique behind the answer
• Five difficulty levels from beginner to expert
• Daily Puzzle Challenges that earn points and gold checkmarks
• Auto-Fill Notes, Auto-Clear Notes and Auto-Check Errors options
• Number Painting to fill open squares quickly

Strengths and weaknesses

• Strength: Hints teach why a number goes in a cell
• Strength: Adjustable font size and auto light or dark mode
• Strength: Global and friend leaderboards
• Weakness: Ads in the free version
• Weakness: Remove Ads costs $11.99
• Weakness: Classic sudoku only, no variants

Key facts

• Developer: Brainium Studios
• App Store name: ⋆Sudoku
• Ad-free option: Remove Ads, $11.99
• App Store ratings: 161,000+ on the US App Store

Where it ranks

Sudoku by Brainium is No. 3 in our Best Free Sudoku Games verdict.