HQ Trivia's viral loops

The chances of winning in HQ Trivia are roughly 1 in 5,000 (depending on the of competitors and the number of winners). A wrong answer to 1 of 12 questions eliminates a user from the game. However, those willing to go the extra mile to get closer to victory can take a short cut. All they have to do is get other people to sign up for the game.

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HQ Trivia also prompts users to share the question they lost on via text, Instagram, or whatever social platform. This too has viral implications:

Why this is really good UX:

• HQ Trivia is leaning into the social aspects of the game by encouraging viral loops
• Users may be highly motivated to make the referral and receive the incentive, and it doesn't cost HQ Trivia anything.