Boris

Boris

Boris Pfeiffer is the co-founder and CEO of Riddle.com, a leading platform for interactive quizzes and audience engagement. He brings a wealth of experience from the gaming and tech industries, having previously led Kabam's European operations and founded his own game studio. Earlier in his career, Boris served as General Manager of Monster.com's Internet Advertising Division in Europe. Boris has deep roots in the quiz industry. As General Manager Europe for Tickle.com, he helped scale the popular quiz portal into the world's 28th largest website by 2004, leading to its acquisition by Monster.com for over $100 million. During this time, he managed international teams of quiz writers and psychologists, developing quiz content for brands, mobile apps, and millions of users across Europe in multiple languages. In addition to his work in quizzes and gaming, Boris has supported a variety of startups across Asia, the U.S., and Europe. He is the author of two books - Facebook Fan Pages (2011) and Quizmaster (2017) - and a proud father of two. He has been happily married for over 25 years.


Header image for blog post comparing Riddle and Involve.me

Riddle is the Best Alternative to Involve.me in 2026

Involve.me and Riddle both create interactive content - but they're aimed at very different use cases. A practical look at why Riddle is the stronger choice for publishers, media companies, and brands that need quizzes, games, and engagement tools built for scale.

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Header image for blog post about monetizing Riddle quizzes and content using in-quiz ads

Monetize your quizzes with in-quiz ads

Turn your quiz traffic into ad revenue. A practical guide to setting up video ads, banner placements, and refresh ads inside your Riddles - all served from your own ad server, with 100% of the revenue staying with you.

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143 quiz titles for online quizzes across a range of topics, as well as tips and best practices to crafting compelling quiz titles.

143 proven quiz titles your audience will love in 2026

Want to use online quizzes to drive engagement, collect leads, and supercharge your marketing funnel? Nothing – nothing – is more important than the right quiz title. Think of your quiz title like the cover of a book. You might have the most insightful questions […]

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Release Log 2026

Riddle Release Log 2025

The current version of our release log is here: Riddle Release Log 2026 Our release log is diligently updated each time we introduce new features to our quiz maker – from formats to features and new lead generation options. You can also visit our release […]

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Riddle acquires Contentbird Convert

Riddle Acquires Convert

Riddle Acquires Convert: Contentbird Convert Becomes Convert by Riddle Riddle, Europe’s market leader for interactive quiz formats used by publishers and media companies, has acquired Convert, Contentbird’s established solution for prediction games and advent calendars in the German-speaking market. With this acquisition, two proven engagement solutions […]

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Why should enterprise organizations use the Riddle quiz maker?

Transform Engagement with Riddle’s Enterprise-grade Online Quiz Maker

It’s harder than ever to capture (and keep) your audience’s attention in today’s digital landscape. Cutting through the noise requires innovative approaches and content that turns passive browsers into active participants. This is where Riddle comes in. As an enterprise quiz maker, Riddle offers a […]

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Release Log 2026

Riddle Release Log 2026

New Features & Improvements Our release log is diligently updated each time we introduce new features to our quiz maker – from formats to features and new lead generation options. You can also visit our release log archives for 2023 and 2024 and 2025. Sign […]

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Data protection in contact forms - how to create GDPR compliant contact forms

Data Protection in Contact Forms: Requirements, Tips, and Templates

Contact forms are among the most frequently used methods for collecting personal data. That’s why it is particularly important to make contact them GDPR-compliant. Data such as a user’s first name, last name, and email address are generally requested. This data is particularly worthy of […]

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Increase time spent on your website with quizzes

Maximize Your Search Engine Ranking by Increasing the Time Spent on Your Site

Search engines like Google or Bing will always provide users with links to the most relevant and valuable content first. The search engine determines the informational value of the content by measuring whether the user remains on the clicked link or returns directly to the […]

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Riddle is GDPR and CCPA compliant

Riddle Quizmaker is Fully CCPA-compliant

CCPA compliance Disclaimer: We do not provide legal advice. We recommend that you seek legal advice from a lawyer about how Riddle’s quiz maker complies with the CCPA.   Riddle is fully CCPA compliant  California introduced its California Consumer Privacy Act (CCPA), which took effect on January […]

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