Can you name the psychological law from a real-world scenario?
40 levels. 40 real psychological laws. Read a counter-intuitive scenario, then identify which law or effect it describes. Levels 31–40 have 5 options for added difficulty.
🎮 Play the full version with community rankings →
- 40 levels covering Murphy's Law, Butterfly Effect, Dunning-Kruger Effect, Sunk Cost Fallacy, Pareto Principle, Survivorship Bias, Streisand Effect, Halo Effect, and 32 more
- Real counter-intuitive scenarios — not textbook definitions. Each question is a story you might recognise from everyday life
- Increasing difficulty — Levels 1–30 have 4 options; Levels 31–40 have 5 options
- Full explanations — every answer reveals the law's origin, why it works, and how it shows up in the real world
- ~20 minutes to complete all 40 levels
| Level | Law |
|---|---|
| 1 | Murphy's Law |
| 2 | Pareto Principle (80/20 Rule) |
| 3 | Butterfly Effect |
| 4 | Matthew Effect |
| 5 | Halo Effect |
| 6 | Bystander Effect |
| 7 | Hawthorne Effect |
| 8 | Pygmalion Effect |
| 9 | Barnum Effect |
| 10 | Parkinson's Law |
| 11 | 10,000-Hour Rule |
| 12 | Herd Mentality |
| 13 | Ratchet Effect |
| 14 | Primacy Effect |
| 15 | Recency Effect |
| 16 | Domino Effect |
| 17 | Analysis Paralysis |
| 18 | Birdcage Effect |
| 19 | Catfish Effect |
| 20 | Kuleshov Effect |
| 21 | Anchoring Effect |
| 22 | Authority Bias |
| 23 | Dunning-Kruger Effect |
| 24 | Sunk Cost Fallacy |
| 25 | Streisand Effect |
| 26 | Weakest Link |
| 27 | Segal's Law |
| 28 | Door-in-the-Face Technique |
| 29 | Tunnel Vision Effect |
| 30 | Gadfly Effect |
| 31 | Blind Following Effect (5 options) |
| 32 | Peak-End Rule (5 options) |
| 33 | Survivorship Bias (5 options) |
| 34 | Confirmation Bias (5 options) |
| 35 | Gambler's Fallacy (5 options) |
| 36 | IKEA Effect (5 options) |
| 37 | Spotlight Effect (5 options) |
| 38 | Cobra Effect (5 options) |
| 39 | Ben Franklin Effect (5 options) |
| 40 | Goodhart's Law (5 options) |
| Feature | This (GitHub) | Full version |
|---|---|---|
| 40-level quiz | ✅ | ✅ |
| Answer randomisation | ✅ | ✅ |
| Full explanations | ✅ | ✅ |
| Deep-dive links per law | ✅ | ✅ |
| Community vote rankings | — | ✅ |
| 40 individual law explainer pages | — | ✅ |
- Single HTML file, no dependencies, no login required
- Works offline after first load
- Correct answers appear in randomised positions on every play (Fisher-Yates shuffle)
- Community voting requires a server — gracefully disabled in this static version
Each law has a standalone deep-dive page on the full site:
- Murphy's Law — Full History & Examples
- Dunning-Kruger Effect
- Survivorship Bias
- Sunk Cost Fallacy
- Butterfly Effect
- Streisand Effect
- Gambler's Fallacy
- Cobra Effect
- ... and 32 more →
MIT — free to use, share, and modify.
Built by Ordinary Man Trying — one Chinese parent using AI to build things in public.