Comparison

Sudoku vs Stacks.

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 logic and memory with this classic number-placement puzzle game. It offers multiple difficulty levels, helpful tools like hints and undo, and daily challenges to sharpen your skills. Enjoy a relaxing yet mentally stimulating experience on your phone or tablet.

Highlights
  • Daily and My Challenges
  • 4 difficulty levels
  • Highlighting of selected numbers and related cells
  • Hint and Intelligent Hint functions
  • Error Cap and Automatic Error-Checking
  • Unlimited Undo/Redo
  • Autosave incomplete games
Features
Read full description

Classic sudoku game now can be played on your phone and tablet. Sudoku is a logic number-placement puzzle game. To win a sudoku game, you need to fill the 9×9 grid with numbers so that there will be no repetitive number in each row, each column and each 3×3 sub-grid, namely numbers 1-9 will only appear once in each row, column or sub-grid. Also, it is a relaxing causal game, but it requires your focus to figure out the solution. Therefore, sudoku will help you exercise your brain and memory because you need to think and utilize your logic when you are playing sudoku. Our sudoku is committed to improve your game experience. It has 4 levels of difficulty for players with different capabilities of sudoku, from beginners to masters on sudoku. Also, it has various functions to help you win the game, such as Hint, Undo/Redo, Take Notes, etc. Moreover, you can practice your skills and challenge yourself by playing Daily Challenge and My Challenge. We are sure you can have great fun and better game experience when you are playing our sudoku. Now, download Aged Sudoku and start figuring out solutions to every puzzle! Features: - Daily Challenge & My Challenge: you can challenge every day to practice your skills of playing sudoku - 4 levels of difficulty - Highlighting: selected number, row, column, sub-grid and other same numbers will be highlighted when one of the cells is selected - Hint: when there is a single solution in the game, you can click Hint and then it will automatically fill the cell with answer - Intelligent hint: when you select the last empty cell in a row, column or sub-grid, you will be reminded of the answer - Error Cap: turn on/off mistake limit - The quantity of remaining numbers is provided - Hide numbers which have used up - Unlimited chances of Undo/Redo - Automatic Error-Checking: when you fill with a wrong answer, it will automatically undo your answer - Autosave incomplete game - Multiple background and appearance styles you can choose - Multiple language choices [Auto Renewable Ads Removal Subscription] ▸ Subscription Service: Remove the ads + Unlimited Hints ▸ Subscription Payment: Once you confirm the payment, you can find the record in your iTunes Account ▸ Subscription Cancelation: Go to “Setting” -> “iTunes Store and App Store” -> “Apple Id”-> ”View Apple Id”-> “Account Setting” -> “Subscription” You have to cancel the subscription 24 hours before the end of previous subscription ▸ Term of Use: https://sudoku.club/terms-of-use ▸ Privacy Policy: https://sudoku.club/privacy-policy

About

Stacks.

A fast-paced arcade game where players drop blocks with precise timing to build high stacks and achieve new personal bests. Unlock cosmetic items and enjoy daily rewards in this engaging, score-chasing experience.

Highlights
  • One-tap gameplay
  • Combo system
  • Unlockable themes and cosmetics
  • Daily free gift
  • Local high scores
  • No account required
Features
Read full description

Stacks. is a fast, satisfying block-stacking arcade game. Drop pieces with perfect timing, build combos, and beat your personal best. FEATURES • One-tap gameplay: easy to learn, hard to master • Combo system and milestone rewards • Unlock themes and cosmetics with coins and gems • Daily free gift and rewarded bonuses • Local high scores and friend challenges • No account required to play Optional in-app purchases provide gems and coins for cosmetics. Spend gems to revive a run, double coins from a finished run, or claim the daily coin bonus. Made for quick sessions and long score-chasing runs alike. How high can you stack?

Screenshots

Sudoku4 screens
Stacks.4 screens

Verdict

The call

The clearest difference is review sentiment: Stacks. at 100% against Sudoku's 50%. Stacks. also leads on rating (5.0 vs 4.5) and update cadence (every 2 days vs every 5 weeks). Sudoku's advantage is ratings volume (660 vs 12) and device support (3 vs 1). On price, ads, in-app purchases and monetization model 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 3 in-app purchases, starting at $0.99 per month and Stacks. sells 7 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Stacks. holds the better App Store score, 5.0 against 4.5. That said, the two scores are not equally well evidenced: Sudoku has 660 ratings behind it against 12, so its average is the more settled of the two. Written reviews point the same way: 50% of Sudoku's written reviews are positive against 100% of Stacks.'s.

UpkeepUpdate frequency

Sudoku ships an update every 5 weeks, Stacks. every 2 days. The most recent releases landed on October 29, 2026 and October 17, 2026 respectively.

Scorecard6 real differences · 4 level
Sudoku versus Stacks.: the parameters behind the verdict, then further details
ParameterSudokuStacks.
PriceFreeFree
Rating4.5 (660 ratings)5.0 (12 ratings) — better
Positive reviews50.3% of reviews100.0% of reviews — better
Number of ratings660 — better12
Update frequencyEvery 5 weeksEvery 2 days — better
AdsYesYes
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPad, iPod — betteriPhone
Requires iOS13.0 — better17.6
Further details — not scored
Size136 MB13 MB
Age rating12+4+
DeveloperAged Studio LimitedKHIZER MAHMUD

Customer experience

Sudoku

All ratings611 ratings
Positive88.2%
Neutral4.3%
Negative7.5%
Written reviews153 reviews
Positive50.3%
Neutral6.5%
Negative43.1%

Stacks.

All ratings12 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews5 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Bugs and requests

Sudoku

Reported bugs

3 issues
  • Ads cause app to freeze or crash
  • Subscription issues with ad removal
  • Incorrect difficulty level labeling

Requested features

4 requests
  • Landscape mode support
  • Auto-fill candidate numbers
  • More advanced difficulty levels
  • Customizable UI and themes

Stacks.

Not enough reviews yet to summarise bugs or requests.

In-app purchases

3 purchases

Sudoku

Subscriptions3
  • Remove Ads - 1 Month$0.991 Month
  • Remove Ads - 3 Months$2.493 Months
  • Remove All Ads - 1 Year$8.491 Year
7 purchases

Stacks.

One-time7
  • 100 Gems$0.99
  • 500 Coins$0.99
  • Starter Pack$1.99
Show 4 more
  • 1,500 Coins$1.99
  • 550 Gems$4.99
  • 5,000 Coins$4.99
  • 1,200 Gems$9.99

Questions

Is Sudoku free?
Sudoku is free to download, with in-app purchases available.
Is Stacks. free?
Stacks. is free to download, with in-app purchases available.
Which has better reviews, Sudoku or Stacks.?
Stacks. is rated higher. Sudoku averages 4.5 out of 5 from 660 ratings, while Stacks. averages 5.0 from 12 ratings.
Do Sudoku or Stacks. have ads?
Both Sudoku and Stacks. show ads.
Which is updated more often, Sudoku or Stacks.?
Sudoku ships an update every 5 weeks, and Stacks. every 2 days. Most recently, Sudoku was updated on October 29, 2026 and Stacks. on October 17, 2026.

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