Are online quizzes still safe to take?, by Boris Pfeiffer

Frontiers The Yo-Yo Intermittent Tests: A Systematic Review and Structured Compendium of Test Results

Boris Pfeiffer, CEO at Riddle, advises startups and young entrepreneurs to avoid external funding and influence for as long as possible. Click here to find out why

Ring Nets Are Coming Out! by Montecito Journal - Issuu

Riddle Quiz Maker Blog - Page 9 of 9 - The best way to engage your customers

Introduction to Criminal Investigation: Processes, Practices and Thinking - Open Textbook Library

Why I don't offer discounts on Riddle.com, by Boris Pfeiffer

The Wild Pack Devise a Plan - Penguin Random House India

What is the best quiz management system that can be used for free? - Quora

5 Secrets to Using Quizzes for Effective Lead Generation - ActiveCampaign Brendan Hufford September 3, 2020

Boris Pfeiffer – CEO and Founder – Riddle Quiz Maker

Riddle, the startup turning quizzes into powerful lead generation tools - StartUp Beat

Quizzes as Lead Magnets - Internet Marketing

Free E-Book: Quizmaster - growth hack your marketing through quizzes and personality quizzes

Together: The Science of Social Psychology - Open Textbook Library