Comparison

Sudoku vs Stack Em! Cosmic Blocks

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

Stack Em! Cosmic Blocks

A relaxing block puzzle game designed for short play sessions. Drag and drop pieces to complete rows and columns, clear space, and aim for high scores. Enjoy satisfying visual and audio feedback with multiple themes.

Highlights
  • Ad-free gameplay
  • Fast offline play
  • No account required
  • Smooth drag-and-drop controls
  • Satisfying clears and combos
  • Multiple unlockable themes
Read full description

Stack Em! is a clean, satisfying block puzzle built for quick sessions. Drag pieces onto the board, complete rows and columns, clear space, and chase a higher score. Features: • Ad Free! Just Play • Fast offline gameplay • No account required • Smooth drag-and-drop block placement • Satisfying clears, combos, sound, and haptics • Multiple visual themes to unlock and enjoy Play at your own pace, restart instantly, and keep improving your best run.

Screenshots

Sudoku4 screens
Stack Em! Cosmic Blocks4 screens

Verdict

The call

The clearest difference is in-app purchases: Stack Em! Cosmic Blocks at none against Sudoku's 3. Stack Em! Cosmic Blocks also leads on ads (none vs shown) and rating (5.0 vs 4.5). Sudoku's advantage is ratings volume (660 vs 2) and device support (3 vs 1). On price 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. Stack Em! Cosmic Blocks asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Stack Em! Cosmic Blocks 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 2, so its average is the more settled of the two.

UpkeepUpdate frequency

Sudoku ships an update every 5 weeks, Stack Em! Cosmic Blocks every 3 days. The most recent releases landed on October 27, 2026 and October 24, 2026 respectively.

Scorecard8 real differences · 2 level
Sudoku versus Stack Em! Cosmic Blocks: the parameters behind the verdict, then further details
ParameterSudokuStack Em! Cosmic Blocks
PriceFreeFree
Rating4.5 (660 ratings)5.0 (2 ratings) — better
Positive reviews50.3% of reviews—
Number of ratings660 — better2
Update frequencyEvery 5 weeksEvery 3 days — better
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPad, iPod — betteriPhone
Requires iOS13.0 — better17.0
Further details — not scored
Size136 MB31 MB
Age rating12+4+
DeveloperAged Studio LimitedJMM Technologies

Customer experience

Sudoku

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

Stack Em! Cosmic Blocks

All ratings1 ratings
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

Stack Em! Cosmic Blocks

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
None

Stack Em! Cosmic Blocks

No in-app purchases

Questions

Is Sudoku free?
Sudoku is free to download, with in-app purchases available.
Is Stack Em! Cosmic Blocks free?
Stack Em! Cosmic Blocks is free to download, with no in-app purchases.
Which has better reviews, Sudoku or Stack Em! Cosmic Blocks?
Stack Em! Cosmic Blocks is rated higher. Sudoku averages 4.5 out of 5 from 660 ratings, while Stack Em! Cosmic Blocks averages 5.0 from 2 ratings.
Do Sudoku or Stack Em! Cosmic Blocks have ads?
Sudoku shows ads; Stack Em! Cosmic Blocks does not.
Which is updated more often, Sudoku or Stack Em! Cosmic Blocks?
Sudoku ships an update every 5 weeks, and Stack Em! Cosmic Blocks every 3 days. Most recently, Sudoku was updated on October 27, 2026 and Stack Em! Cosmic Blocks on October 24, 2026.

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