Comparison

Sudoku vs Stack by Stack!

Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.

Head to head
About

Sudoku

Engage your mind with a vast collection of classic Sudoku puzzles. This app offers various difficulty levels, helpful tools, and daily challenges to keep you entertained and sharpen your cognitive skills. Enjoy a relaxing yet stimulating experience anytime, anywhere.

Highlights
  • Thousands of Sudoku puzzles
  • Multiple difficulty levels
  • Hints and auto-check tools
  • Daily challenges
  • Progress tracking
  • Dark themes
  • Mistake checker
Features
Read full description

Enjoy endless Sudoku puzzles with Brainy Sudoku.studio, one of the most popular Sudoku apps on the App Store! Join millions of players who also love Sudoku block jigsaw puzzles, math crossword – number games, and more! The Brainy Sudoku Puzzle app offers thousands of puzzles to keep your brain active, unwind from stress, and relax. Download now to start playing! Classic Sudoku for Everyone: Whether you're a beginner or an expert, Brainy Sudoku Puzzle has something for you. Relax or challenge your mind with different difficulty levels math crossword number puzzle apps. Enjoy a stimulating break and clear your head with Brainy Sudoku Puzzle, just like solving puzzles with pencil and paper. Features to Enhance Your Experience: Choose Your Level: From easy to expert Helpful Tools: Use hints, auto-check, and highlighted duplicates to make solving easier or complete the challenge on your own. Daily Challenges: Complete daily puzzles Track Your Progress: View your statistics and see how you improve. Dark Themes: comfortable playing experience, even in the dark. Notes: Keep track of possible numbers with automatic updates. Mistake Checker: Check to see mistakes as you go, or challenge yourself without it. Avoid Duplicates: Highlight duplicates to prevent repeating numbers in rows, columns, or blocks. Challenge your brain with Brainy Sudoku Puzzle anywhere, anytime! Your privacy is important to us, and we have a clear privacy policy. Terms of Use: https://craox.com/terms-of-use/sudoku-brain-number-games-ios Privacy Policy: https://craox.com/privacy-policy/sudoku-brain-number-games-ios

About

Stack by Stack!

Features
Read full description

Stack by Stack is a clean, satisfying block puzzle where you place three pieces at a time and clear lines with rhythm. Plan ahead, build combos, and keep the board alive as the pace ramps up. Two ways to play: - Endless Mode: chase your best score with smart placement and big clears - Daily Puzzle: a fresh puzzle to solve each day Track your progress with score, lines cleared, combo streaks, and local stats.

Screenshots

Sudoku4 screens
Stack by Stack!4 screens

Verdict

The call

The clearest difference is in-app purchases: Stack by Stack! at none against Sudoku's 5. Stack by Stack! also leads on update cadence (every 4 days vs every 5 weeks). On price, ads, device support and iOS requirement there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Sudoku sells 5 one-off in-app purchases. Stack by Stack! asks for nothing beyond the download.

UpkeepUpdate frequency

Sudoku ships an update every 5 weeks, Stack by Stack! every 4 days. The most recent releases landed on August 22, 2026 and September 27, 2026 respectively.

Scorecard2 real differences · 8 level
Sudoku versus Stack by Stack!: the parameters behind the verdict, then further details
ParameterSudokuStack by Stack!
PriceFreeFree
Rating3.3 (26 ratings) — better—
Positive reviews20.0% of reviews—
Number of ratings26 — better—
Update frequencyEvery 5 weeksEvery 4 days — better
AdsYesYes
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS15.0 — better15.1
Further details — not scored
Size165 MB94 MB
Age rating4+4+
DeveloperCraox Technologies LLP.ByeongUk Choi

In-app purchases

5 purchases

Sudoku

One-time5
  • Lifetime Deal - Limited Period$1.99
  • 10 Hints$1.99
  • Remove Ads$2.99
Show 2 more
  • 50 Hints$3.99
  • 250 Hints$14.99
None

Stack by Stack!

No in-app purchases

Questions

Is Sudoku free?
Sudoku is free to download, with in-app purchases available.
Is Stack by Stack! free?
Stack by Stack! is free to download, with no in-app purchases.
Do Sudoku or Stack by Stack! have ads?
Both Sudoku and Stack by Stack! show ads.
Which is updated more often, Sudoku or Stack by Stack!?
Sudoku ships an update every 5 weeks, and Stack by Stack! every 4 days. Most recently, Sudoku was updated on August 22, 2026 and Stack by Stack! on September 27, 2026.

Other comparisons