Escape Team, a printable escape room https://www.escape-team.com
All revenue is generated via in-app purchases, and it is about 60% iOS, 40% Android.
People download and print a mission PDF with all the physical cut-fold-and-draw puzzles, then the app offers a $1.99 in-app purchase to unlock the audio narrative/gameplay for that mission. Most revenue comes from mission packs, which are $6.99 for four missions.
I am doing zero advertisement, if just works by word of mouth. I think that is because the game is a very fun and social activity. I also see hundreds (!) of custom missions being created for Christmas in the Mission Editor, there seem to be a lot of escape room-savvy Santas this year.