Comparison

0h h1 vs Sumaddle

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

Head to head
About

0h h1

This logic puzzle game challenges you to fill a grid with red and blue tiles based on three simple rules. It offers unlimited puzzles across four grid sizes, providing a brain-teasing experience without ads or in-app purchases.

Highlights
  • Tile-based logic puzzles
  • Three simple rules
  • Unlimited puzzles
  • Four grid sizes (4x4 to 10x10)
  • Tap to change tile color
Features
Read full description

0h h1 is a little logic game that follows three simple rules: - Three red tiles or three blue tiles next to each other in a row or column isn't allowed - A full row or column must have as many blue tiles as it has red ones. - No two rows are the same. No two columns either. Simply tap a tile to make it red or blue and complete the grid. 0h h1 gives you unlimited puzzles for all four grid sizes: 4 x 4 6 x 6 8 x 8 10 x 10 0h h1 is free, without ads, without social network requirements, without locked features and without nag screens. 0h h1 is a little gift to you. We hope you enjoy it. 0h h1 can also be played on 0hh1.com.

About

Sumaddle

This logic puzzle game transforms pencil-and-paper challenges into interactive brain teasers. Fit number combinations to clues using pure logic, with no mental arithmetic required. Enjoy over 150 free puzzles of varying difficulty, with built-in help and offline play.

Highlights
  • Interactive logic puzzles
  • Number combination fitting
  • Pure logic solving
  • Built-in help and mistake correction
  • Over 150 free puzzles
  • Offline play
  • Ad-free experience
Features
Read full description

• “Brilliant puzzle game”, UK App Store review Apr 2025 • “Best Puzzle Game I’ve Ever Played”, US App Store review Jan 2025 • “The ONLY iOS game I've never gotten tired of”, Reddit review Apr 2024 This type of logical puzzle was first seen in the Japan Puzzle Championship 2006 and is sometimes known as Doppelblock, or Smashed Sums. When played with pencil and paper, these puzzles can be hard work to solve. Sumaddle changes that by adding the essential element of interaction. This transforms the puzzles into intriguing brain teasers that unfold before your eyes. Each puzzle has a unique solution. Finding the solution involves fitting the number combinations to the clues. The app makes it easy to view the possible combinations, you don’t need to do any sums in your head. Instead, you can focus on using logic to narrow down the combinations and find a fitting arrangement. Some reasons why you will enjoy playing Sumaddle: • puzzles range in size and difficulty from small and simple to large and mind-blowing • more than 150 puzzles are included for free • all puzzles can be solved with pure logic, no mental arithmetic required • the sophisticated built-in help can explain the logical reasoning at each step and also fix mistakes if you go wrong • the built-in help is completely free, use it as much as you like • works offline (great for long journeys) • a high standard of accessibility, including comprehensive support for VoiceOver • ad-free play - there are absolutely no ads! IGRS age rating (Indonesia Game Rating System): 3+ Designed and developed in Winterthur, Switzerland

Screenshots

0h h14 screens
Sumaddle3 screens

Verdict

The call

The clearest difference is monetization model: 0h h1 at free against Sumaddle's free with in-app purchases. 0h h1 also leads on iOS requirement (8.0 vs 16.0). Sumaddle's advantage is update cadence (every 3 weeks vs every 3 months) and rating (4.9 vs 4.7). On price, review sentiment, ratings volume and ads 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. 0h h1 sells 1 one-off in-app purchase and Sumaddle sells 15 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Sumaddle holds the better App Store score, 4.9 against 4.7. Both are backed by a comparable volume of ratings — 299 and 767 respectively. Written reviews point the same way: 91% of 0h h1's written reviews are positive against 95% of Sumaddle's.

UpkeepUpdate frequency

0h h1 ships an update every 3 months, Sumaddle every 3 weeks. The most recent releases landed on October 17, 2026 and October 12, 2026 respectively.

Scorecard4 real differences · 6 level
0h h1 versus Sumaddle: the parameters behind the verdict, then further details
Parameter0h h1Sumaddle
PriceFreeFree
Rating4.7 (299 ratings)4.9 (767 ratings) — better
Positive reviews90.5% of reviews94.9% of reviews — better
Number of ratings299767 — better
Update frequencyEvery 3 monthsEvery 3 weeks — better
AdsNoNo
In-app purchasesYesYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS8.0 — better16.0
Further details — not scored
Size3 MB30 MB
Age rating4+4+
DeveloperQ42Jonathan Buchanan

Customer experience

0h h1

All ratings299 ratings
Positive95.0%
Neutral2.3%
Negative2.7%
Written reviews74 reviews
Positive90.5%
Neutral0.0%
Negative9.5%

Sumaddle

All ratings767 ratings
Positive98.3%
Neutral0.7%
Negative1.0%
Written reviews98 reviews
Positive94.9%
Neutral1.0%
Negative4.1%

User reviews

0h h1

From 299 App Store ratings

What we love

  • ✨ No ads or in-app purchases
  • 🧠 Challenging yet simple gameplay
  • 💡 Helpful hints provided
  • 🧠 Great for focus and ADHD
  • 👍 Long-term player satisfaction

Room to improve

  • ⚠️ Clipboard access prompt
  • 🐛 Progress sometimes lost on closing app
  • 🐛 Leaderboard scores appear impossible (negative times)
  • 🐛 Hints sometimes incorrect or unhelpful
  • 🐛 Start game over option missing

Sumaddle

From 767 App Store ratings

What we love

  • 👍 Fun and challenging game
  • 👍 Clean and intuitive interface
  • 👍 Helpful hint system
  • 🚀 No ads or data collection
  • 💡 Unique puzzle concept

Room to improve

  • 🐛 Automatic hints can be intrusive
  • 🐛 Inability to replay completed puzzles
  • 💡 Need more free/sample puzzles
  • 💡 Difficulty progression could be improved

Bugs and requests

0h h1

Reported bugs

6 issues
  • Progress forfeited when closing app
  • Randomly asks permission to paste from clipboard
  • Leaderboard scores with negative times
  • Hints sometimes incorrect or unhelpful
  • Error display not reliable after update
Show 1 more
  • Occasional crashes (implied by 'buggy')

Requested features

13 requests
  • Continue game progress after closing app
  • In-game stats (games played, best times, scores)
  • Option to start game over
  • Option to highlight and erase incorrect cells
  • Customizable color palettes
Show 8 more
  • iCloud syncing of scores
  • More difficulty settings or games
  • Timed version for scoring
  • Holiday themes
  • Sound effects for clicks
  • Background soundtrack
  • Bigger maps/grids (e.g., 12x12)
  • Integration with Game Center

Sumaddle

Reported bugs

2 issues
  • Losing progress when minimizing the app
  • Inconsistent difficulty ratings

Requested features

4 requests
  • Ability to selectively pencil in notes
  • More difficult puzzle options
  • Synced progress across devices
  • Detailed statistics and leaderboard

In-app purchases

1 purchases

0h h1

One-time1
  • 0h h1 Supporter$0.99
15 purchases

Sumaddle

One-time15
  • Quirky, Pack 5$0.99
  • Very Difficult Puzzles$0.99
  • Quirky, Pack 1$0.99
Show 12 more
  • Premium 9x9 Puzzles, Pack 1$0.99
  • Crafty, Pack 1$0.99
  • Crafty, Pack 2$0.99
  • Crafty, Pack 3$0.99
  • Sneaky, Pack 1$0.99
  • Sneaky, Pack 2$0.99
  • Sneaky, Pack 3$0.99
  • Tricky, Pack 1$0.99
  • Tricky, Pack 2$0.99
  • Tricky, Pack 3$0.99
  • Assorted Puzzles$0.99
  • Puzzle Generator$9.99

Questions

Is 0h h1 free?
0h h1 is free to download, with in-app purchases available.
Is Sumaddle free?
Sumaddle is free to download, with in-app purchases available.
Which has better reviews, 0h h1 or Sumaddle?
Sumaddle is rated higher. 0h h1 averages 4.7 out of 5 from 299 ratings, while Sumaddle averages 4.9 from 767 ratings.
Do 0h h1 or Sumaddle have ads?
Neither 0h h1 nor Sumaddle shows ads.
Which is updated more often, 0h h1 or Sumaddle?
0h h1 ships an update every 3 months, and Sumaddle every 3 weeks. Most recently, 0h h1 was updated on October 17, 2026 and Sumaddle on October 12, 2026.

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