Last updated on February 14th, 2026 at 02:01 pm
0h h1 – Puzzle Game Review
0h h1 is a Puzzle/Board/Education game from Q42, first launched in 12th November 2014.
It’s rated 4+ and currently has 300+ ratings on the App Store.
What Makes 0h h1 Stand Out
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.
This Puzzle game offers engaging gameplay and regular updates for mobile players.
Player Feedback
As a newer release, 0h h1 is building its player community. Early feedback suggests .
Recent Updates & Development
Latest Update: 21st October 2017
Recent improvements include:
This app has been updated by Apple to display the Apple Watch app icon.
Updated for iOS11.
Download & Availability
0h h1 is available through the official App Store for iOS devices.
Requirements: Requires iPhone 5s / iPad Air / iPad Air (Cellular) / iPad Mini 2 (Retina) / iPad Mini 2 (Retina, Cellular) / iPhone 6 / iPhone 6 Plus / iPad Air 2 / iPad Air 2 (Cellular) / iPad Mini 3 or later.
Compatible with iPhone and iPad devices.
Player Experience Highlights
Community Insight:
Honestly our primary praise is that there are no ads, in app purchases, energy, or anything like that. Its just a simple puzzle game but its still challenging at the same time.
We love that it gives you hints when you get stuck. Easy to learn yet challenging to master. Great little brain tickler and alternative to mindless scrolling.
We are totally hooked to this app! Focusing is hard for us and this helps us a lot.
Awesome game, super fun and challenging. For anyone complaining about the paste from clipboard feature. The game hasnt been updated in a while and when Apple introduced that feature it hasnt been removed from this game. If you dont actively have something in your clipboard it wont ask. Also if it does ask you say no and it wont actually read that data.
As others have said, this game does wonders for ADHD. Its also the only game that we consistently play for years when others we usually get bored of really quickly. Only thing that even remotely bothers us about it is that it likes to randomly ask permission to paste things when we go from one app to this one? Like, it randomly pops up the Allow paste thing for some reason.
This game has served as an ideal aid for us to pay better attention to college lectures. It has no required auditory components and requires no reading, while providing a sufficiently challenging puzzle ti prevent our mind from wandering while not being so complicated we ignore the lecture we are listening to. It has no necessary time component, so the game can be paused and resumed at any time, allowing us to take notes as necessary or otherwise engage in class as needed. Both games in the series have been incredibly helpful, and are fun in their own right. We're thankful to the devs for creating and maintaining these titles. Now working as a professional counselor, we recommend these games to our ADHD clients who are under-stimulated in lecture settings.
This game is so fun yet so simplistic. The storage optimization is phenomenal and gameplay-wise, this is really smooth! The gameplay is really fun with 5 different sizes of grids. The 3 given rules are easily memorizable and enough to solve the puzzle, and you feel very good when you solve a large grid. With not even 5 megabytes, basically anyone can get this game. The storage is very low and a good game for people with near full storage. This game is very visually appealing as well. The designs are simple, sleek and easy to see whats going on. The color schemes go really well together and overall are very nice. Id have to give this a solid 10/10. Simple yet nice colors, great storage optimization and solid gameplay. If your into puzzle games, we would strongly suggest this app. Great job, developers.
Our all-time favorite phone game. We use it to decompress and have been playing it for maybe five years now. Scoring is based on how much you play so Im pretty up there on the global scoreboards! Thanks for creating such a fun game.
Ive been playing this game for years always a pleasure to rediscover it on our Home Screen. We love the challenge and relaxation. We will say Im high up on several leaderboards and being beat out by those with negative times. Not sure how they managed that. Id love for those scores to be blocked from the leaderboards as its physically impossible to do something in a negative amount of time.
Ive played this game for over a year now, and we absolutely love it. While we cant play it for hours by itself, when we play it with an audiobook we can do that for hours. Other mobile games dont work that well with audiobooks, because game audio or ads can smother the book. This game has neither! Definitely worth a dollar. – Yay.
This is our go to game. Ive played every day for a while now!! Easy to pick up, but still a brain scratcher 100s of puzzles in. 10/10 it would be cool to have an IAP that allowed for custom palettes.
We had a longer review written and when we switched screens it all got lost. So to recap: love the game, love the app, super simple and cute yet fun and challenging. Love that there are no ads and hope it stays that way. Love the optional $0.99 to support it and honestly we would pay more than that! Okay now to the good stuff. This is what Id like to see in future versions: 1) Continue game. When we close the app, our progress is forfeited and when we go back into it we need to start a new game. While not a dealbreaker, Id like the option to continue the game we were playing before. 2) Stats. While there is the leaderboard and Game Center stuff, Im really only interested in playing against ourselves and seeing our progress. In the settings Id like to see our stats like how many games Ive played of each level and the corresponding best times and scores. 3) Tweaking the hints. While the hints are helpful, we have found a couple games where we think Ive finished and the hints tell us a certain row or column is incorrect but we have yet to be able to figure out a way to find and then fix the error(s) and finish the game. The only option seemed to be to hit the back button until the beginning of the game and start over. (Maybe a start game over option would be good as well!) Id probably like to be given the option to start over or highlight and erase the incorrect cells so we can finish the game. Thats all we have for now. Thank you.
When we launch this app, Ill get a message that its trying to paste from our clipboard. Whats up with that? Password / credit card harvesting.
Theres absolutely no reason for this app to read clipboard data without any explicit action by user. This is nefarious. Uninstalled.
Because this developer made such an awful game based on logic and numerical operations, our friends and we were forced to make a C++ program for a class in college. Thanks for making such a trashy game.
We were introduced to this game by a friend – she kept playing and we wanted to see what it was all about. We quickly became addicted.
We have never made a review for a game but this game is honestly so great. There are no ads first off , which is amazing. Everything is free. We love the concept and how simple yet difficult the game is . We reallly wish there were more levels though because the hardest level is now too easy for us due to how much we play . But all in all our favorite game ever.
We love this. So unique and genius.
A fun, quick-ish game that makes you think a bit. Thanks guys.
Love the thought that has gone into making these puzzles, and the thought required to solve them.
This game always relaxes us! We too, would love to see more difficulty added.
The rules are simple, but the puzzles are challenging. This is a fun, casual puzzle game that we can't stop playing. It's very relaxing and a great alternative to games with timers and in-app purchases.
The game play is simple yet addicting. Most "addicting" games hook you with in-app purchases, energy or heart timers, daily bonuses, social network intigration, and all that jazz. The we see with that is the player is not addicted to the game anymore, but to everything else. 0h h1 gets players to come back for the game and thats exactly why this game is the paragon of all puzzle games.
We don't play games, but we play this one.
Addictive and free with no ads.
Great fun mind game for when you have a minute or two of down time in the day. Easy to stop and start throughout the day. We were addicted after the first day! 400 rounds later and we still find it very enjoyable to play. A great new classic game as others have said.
0h h1 is simple but challenging, addictive but not time-consuming, and at least for now completely free (no ads, free hints). Its the perfect successor to whatever your last favorite little puzzle game was. The one thing Id love to see in the next version: iCloud (or similar) syncing of your score. We play on both our iPhone and our iPad, and Id like to see our total carry over from one to the other.
It's sad that one of our favorite parts of a game these days is "it doesn't charge for hints" but alas. This one doesn't, so it's awesome. Also doesn't charge for anything else, no ads, doesn't prompt you to rate it, and is in general a good game.
This game is insanely easy to learn, incredibly fun to play. An instant classic.
Very nice game. Would be great if there's a timed version, where the score is calculated by how quickly it's solved.
We loved this game from the moment we began playing. With the influx of too many repetitive and copying puzzle games allowed in the App Store, this puzzle game is refreshing. Our only comment is to add much more difficulty settings or games. We read many complaints of games being too difficult so they give up and delete, but this is the mentality of the culture. If one has to think too much they give up. But there're a lot of us who want to be challenged. We'd gladly pay to have an update where puzzles take much more thought and planning to complete. Don't be afraid to challenge people.
A perfect brain teasing game that's easy to launch and start. App has beautiful & subtle aesthetics along with well-built code.
Most puzzle games, we tend to go through them quickly and delete them after we solve the hardest difficulty, but we find ourselves always coming back to this one. No leaderboards, no timers, and no penalty for showing hints. With all the "gamification" taken out, it removes the usual reasons for us to delete a puzzle game. With leaderboards, we are usually never even remotely close to the top, and out of frustration, we delete the app. Simple idea, great logic puzzle.
Great free, little logic game with no gimmicks! Will be on our phone for a while.
Very elegant and entertaining game. It's fairly easy once you learn a few tricks, though. Might be good to have some more challenging settings, e.g. Reducing the number of free tiles.
This is a great little puzzle app to pass the time. Not too hard, not too easy. Just right.
We love the game's minimalist design and the rules are just tricky enough to make each puzzle sufficiently challenging. Definitely recommended for short bursts of logical brain-picking.
User feedback from Apple App Store
App Details
- Version: 1.3.5
- Size: 2.83 MB
- iOS: 8.0 or later
- Languages: EN
- Content Advisory:
- Developer: Q42
Last updated: 21st October 2017 | Genre: Puzzle, Board | Developer: Q42