Puzzles that make you think.
Riddlewords is a logic puzzle platform built around a simple idea: critical and creative thinking are valuable skills you can train.
So we made a serious game of it.
- 15+ puzzle types and "unlimited" questions ranging from classic riddles to formal and reasoning-powered logic. Puzzles →
- Puzzles use established frameworks and structured principles you can learn in our library and practice through play. Frameworks →
- Your answers are scored by AI using those frameworks of knowledge and multi-quadrant scoring rubrics. Scoring →
Riddlewords was created by the engineers and entrepreneurs at Fractionl. These apps are passion projects we work on to create things that are fun, helpful, intellectually stimulating, and that bring people together.
Our apps are free of ads, add-ons, and gimmicks. The subscriptions and ability to purchase AI credits are there to cover the costs of using AI services.
PricingAI-Powered scoring and feedback on your answers using structured reasoning frameworks and detailed scoring rubrics.
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Real Knowledge Frameworks
Puzzles can be tied to structured frameworks — real bodies of knowledge with named rules and categories. Players don't just memorize labels — they learn to identify patterns, apply principles, and reason through problems the way experts do.
- Attacking Faulty Reasoning — T. Edward Damer's taxonomy of logical fallacies — identify which criterion of a good argument has been violated.
- Systems Thinking — Based on the work of Donella Meadows, Peter Senge, Jay Forrester and more — see feedback loops, delays, and structural patterns instead of surface-level events.
Riddlewords is made for...
- Puzzle lovers — adults who want something harder than trivia and more rewarding than brain teasers. Earn XP, climb the leaderboard, and unlock titles across 200 levels.
- Educators & students — a way for young learners to practice critical thinking, logic, and argumentation that feels like play. Every answer gets real feedback, not just a grade.
- Content creators — author your own puzzles, provide model answers and AI scoring instructions, and earn creator XP when others play your content.
Ready to test your reasoning?
Free to play. No credit card. Sign up in 10 seconds and start solving puzzles.