https://www.theverge.com/2018/7/5/17536280/hq-trivia-mobile-game-scott-rogowsky-extra-lives

This week HQ Trivia rolled out a new feature that rewards players for playing multiple games in a row. It’s called “Streaks,” and it’ll be pretty familiar to anyone who has played a mobile game in recent years.

Streaks is pretty simple. You play multiple games in a row, you get extra lives. Similar to opening up Animal Crossing: Pocket Camp and getting a few bells or furniture items just for continuing to play the game. It’s a clear strategy for player retention as it incentivizes players to open up the app and partake at least once a day.