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.


A.I. Quiz Maker from Riddle.com - create quizzes in seconds

Riddle’s AI Quiz Maker Helps Generate Content in an Instant

Introduction Quizzes and personality tests are considered powerful marketing tools. Benefits range from engaging your audience with interactive content, driving traffic to your website, gathering important customer intel, and generating high-quality leads. However, creating a good quiz takes time – you’ll need to research the correct […]

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How to create GDPR-compliant content

How to Create GDPR-Compliant Interactive Content

We prepared this guide as a summary of the key areas to focus on if you want to create GDPR-compliant interactive content with Riddle’s quiz maker. In 2025, GDPR-compliance is more important than ever, with TikTok being fined €530 million and Google €200 million – and over […]

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What is an NPS - Net Promoter Score

Net Promoter Score (NPS): Definition, meaning & calculation

What is NPS® ? The Net Promoter Score ® (almost always shortened to NPS ®) is a universal measure of customer satisfaction and the strength of customer loyalty. It is based on the key question: “How likely is it that you would recommend our company/product/service […]

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Make your own crossword puzzle

Make A Crossword Puzzle

Creating your own online crossword puzzle Learn how to create a crossword puzzle with Riddle.com. Creating a crossword puzzle for your website is a fun activity and will also help you with reader engagement, plus increase the time your visitors spend on your website. Crossword […]

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Club Med - Case Study Cover Image

Club Med: Travel Industry – Case Study

Club Med used Riddle to turn a resort launch into a four-week quiz campaign, achieving a 72% completion rate, an 83% lead opt-in rate - nearly triple the platform average - and over 24,000 minutes of total fan dwell time.

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20 Minuten - 20min.ch - case study - boosting ad revenue with riddle quizzes

20minuten: Publisher – Case Study

Swiss publisher 20min.ch uses Riddle to turn interactive content into measurable ad revenue, achieving an 80% quiz start rate, 72% completion rate, and a 20% uplift in overall ad revenue.

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Case Study - Riddle for athletes - Gabriel Clemens

Gabriel Clemens : German Darts Professional – Case Study

German darts professional Gabriel Clemens uses Riddle to build a direct fan relationship beyond social media. His quizzes achieved a 96% lead conversion rate and score predictors hit 100%, growing an owned audience he can reach anytime.

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What is churn management?

Churn Management: Proven Strategies for Effective Churn Prevention

Churn management is essential for sustainable business growth – especially for SaaS companies. It focuses on churn prevention by identifying why customers leave and taking action to retain them. With the right churn management strategy, companies can reduce customer loss, increase loyalty, and boost long-term […]

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Create digital badges with Riddle quizzes and Navigatr

Create a digital badge from a quiz

Automated awarding of digital badges by integrating Riddle.com quizzes with Navigatr LinkedIn profiles are more than just digital CVs. They’re a space to showcase verified skills and achievements. One of the most effective ways to do this is by sharing digital badges – portable, verifiable credentials that […]

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Case Study: Immediate Media - A Burda Company. Boosting engagement and organic reach with Riddle quiz maker.

The Quiz Effect: Immediate Media’s Winning Formula with Riddle – Case Study

Immediate Media uses Riddle across its History Extra brand to drive deeper reader engagement, with 15.5% more clicks on quiz pages, 21% more click events per session, and a 20% boost in time on site.

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