This app was mentioned in 5 comments, with an average of 1.20 upvotes
Wow, this is awesome of you!
I don't want to enter the contest since I practically don't pay for games on my phone, but I wanted to chime in and thank you for your generosity. Also, now that I know about your YouTube channel I will definitely be tuning in to check out what games people are into these days.
And to answer your question, my longest installed game is Jason Linhart's Sudoku. I've had it since I first got into Android phones way back on the original Moto Droid and it's been on every phone since. I play it almost daily as I lay down to unwind at the end of the night, and it's been absolutely great to me all these years.
Personally, I'm partial to Sudoku puzzles, and particularly the Enjoy Sudoku implementation. Originally purchased it on an iPhone 3G, and it was my first purchase when I switched to the Android platform.
Enjoy sudoku is great
also there is suguru and kropki which are both good puzzle games.
I recommend the Enjoy Sudoku app for Android. Link https://play.google.com/store/apps/details?id=com.enjoysudoku.enjoysudokudaily
There's also a paid version, which I use, that I can vouch for.