About 8 years in, Escape Team steadily keeps growing, which surprises me (I didn’t add any new missions for about 5 years):

https://www.escape-team.com

It‘s making about $700 on iOS and $300 on Android, solely from $2.99 IAPs for the later missions in the game (the first 2 missions are free).

I think a main reason for this is that escape rooms (and games) don’t „saturate“: you play them only once, because then you know the solutions. So another escape room (place, game, app) doesn’t cannibalize the market - it may rather strengthen the others by fostering it as a group activity.

I also put 0$ into ads- it solely spreads itself by being a group activity (3-5 people are best) and through its mission editor (people can make their own missions, used in school and for birthdays etc).

Curious to see where it goes next!