Hey! I am the developer of this app! After rebuilding my app 3 times, many wasted nights, I persevered & completed my beautiful Sudoku app. Sharing my experience with you guys! Here's some backstory. I originally started working on this app last year summer time. While working on it, my code got quite messy and I ended up abandoning it. Then I returned back to it in October last year and started from scratch again. I worked on it for 2 months and I got frustrated again. This was mostly because I don't have much experience with coding games and code was getting quite messy. Plus I wasn't satisfied with the UI of my app and thought it looked pretty ugly. I was also being too ambitious with the app as I was trying to make it support dual-player where 2 people could play on the same sudoku board. This was quite difficult as firstly it required a server backend, which despite me having backend experience, was quite hard to implement as it needed 2 phones to be always in sync with each other. Also from some additional research, I found that there actually wasn't much interest in dual player sudoku. So my code base was getting super bloated with having to support dual player - something which wasn't even much desired by many people. Another thing wrong with these 2 prior attempts was that I had wasted a lot of time trying to get Python working on iOS. The Sudoku puzzle generation logic was written in Python (not mine, I was using an open sourced one) and when a new game started, I would run the Python script on iOS, generate a new puzzle and so on. This itself took me about 2 weeks to figure out and was a complete pain in the ass. Plus it also falls in a gray area of Apple's review system as they are usually not too fond if you running such scripts in your app. So it risked getting rejected in app review. The puzzles generated by the python script were also not "hard" enough. So I ended up scrapping the whole thing. So I started it again on around January 20th, again from scratch. Fortunately, having built the app to 75% completetion twice already and abandoning it, I had plenty of code logic which I could reuse after some clean up. This also gave me an opportunity to redesign the UI to make it less ugly. Instead of running the python script on iOS to generate the puzzles, I pre-generated 50,000 puzzles (10,000 for each difficulty) on my Mac and included them in my app. I go by 80/20 law as 80% of the work was pretty much done in 1 week in this third attempt. Then I spent the next week mostly on settings, theme customization etc. I was finally able to finish this app and submitted it. When it comes to such projects, perseverance is the key to completition. I was stuck many times, the UI wasn't up to my self-imposed standards etc. The 3 re-attempts helped me fix those issues and finally get the thing out of the door. Even though I said "wasted nights" in my title, I don't really consider them a waste as I learnt lots of new things in those wasted hours. I think I am content with what I have built and am ready to share it with you guys! Hope you like it! ------------ In case you are curious what differentiates my app from other hundreds of sudoku apps out there: 1. My opinion is ofcourse biased but I do think I have a nicer looking UI and UX in my app. 2. Haptic feedback - when you enter a correct or incorrect answer, you feel different vibrations in the app using the haptic engine. I thought this was really required to give a feeling of "small step to success" towards completetion of the puzzle. 3. Themes and customizations to make the app as close to how you like it as possible. The dark AMOLED Orange theme is my personal favorite as it looks super crisp. 4. Unfair and Extreme level of puzzles are actually super hard (at last that's my and couple of my testers' experience). 5. After a game is finished, you get your overall stats like total time spent, best time, average time, overall score, hints used, mistakes made etc. I personally haven't found any other app present all these stats at the end of a game in a "pretty" way. 6. My app also comes with a graph of how your scores progress over time. https://www.dropbox.com/s/zxrqqu... As you play more difficult levels, you get more score. Each higher level gives twice the number of points as the previous level. 7. Sudoku Extreme can automatically pre-fill the notes and auto-remove them when they are used in a row, column or block. I personally encorage disabling this setting and filling it manually as it makes your brain more active! Also if you fill them manually, you get extra points when you finish the game! 8. The quick fill feature lets you tap-and-hold a number and then simply tap cells and it will fill it with that number. 9. Numbers show how many instances of that number are left to be filled in the puzzle. When a number has been used 9 times correctly, it hides itself. You can disable this setting if you like. 10. Pleasing animations when you fill an entire row, column or block as well as when you finish games! https://www.dropbox.com/s/b15isg... I thought this was essential to make the app as engaging as possible. Anyway, this is obviously my biased opinion about my app. I am curious to hear what feedback you guys have! Let me know if there is any feedback or any questions about the development process! I plan on sending an update which includes global leaderboards in the app in the upcoming days. Here's a few extra videos and screenshots of the gameplay: https://www.dropbox.com/sh/jc0ii...

Sudoku Extreme Brain Puzzle :)

Beautiful Sudoku app with 5 levels, themes and stats

Beautiful Sudoku app with 5 levels, themes and stats