Then there's Crush Time, which is a mini-game in Happn geared towards finding who likes you. Each round consists of four profile cards, and you're to guess which one of those four people have a crush on you. If you guess incorrectly, you can try again but it'll cost you a credit.
The credits in Happn are rather scarce and limited, so you'd best not waste them. They're used to send charms to people who you want to notice you and get more guesses in Crush Time.