Which reason doesn't hold up?
Read the argument, then tap that reason.
What Dojo is
Think clearly. Argue fairly. Nine thinking skills, practiced in short drills. Free.
Belt Progression
How It Works
Martial arts training for your mind: structured, progressive, and rewarding.
Pick a mode
Choose a training mode. Each one works a different thinking skill.
Answer challenges
Spot fallacies, evaluate sources, build arguments, and question assumptions.
Earn XP and advance belts
Every correct answer earns XP. There are nine belts, White through Black.
Track your streak
Daily challenges keep you sharp. Build a streak and watch your reasoning improve.
Twelve Ways to Train
Each mode targets a different critical thinking skill. Together, they build a complete reasoning toolkit.
Fallacy Flash
Rapid fallacy identification, the core drill. Read a short argument, spot the logical error. Progresses from multiple choice to free-text identification as you advance.
- ▸What you miss comes back for review
- ▸Sound arguments are mixed in, so you also learn when nothing is wrong
- ▸A plain explanation after every answer
Steel Man
Construct the strongest version of an argument you disagree with. The single most important skill for democratic discourse.
- ▸AI-scored on charity, evidence & steelmanning
- ▸Real-world policy positions
- ▸Constructive feedback on every attempt
Rhetoric Precision
Say what you mean. Take a vague political or public statement and rewrite it to say exactly what it means, no more, no less. Strip the weasel words and name the specifics.
- ▸AI-scored on precision, fidelity & clarity
- ▸10 statements across politics, PR & media
- ▸A precise rewrite revealed after every attempt
Source Check
Evaluate claims paired with citations for reliability. Learn the evidence hierarchy from meta-analyses down to anonymous social media posts.
- ▸Source reliability scoring
- ▸Claim-source alignment checks
- ▸Missing context identification
Argument Map
Visually decompose arguments into claims, premises, and evidence, then draw the connections. The single highest-impact critical thinking technique (0.70 SD gain).
- ▸SVG argument tree builds as you play
- ▸Identify claims, premises, evidence & assumptions
- ▸AI-scored at Green belt and above
Daily Challenge
Same 5-question fallacy challenge for everyone, every day. Compete on score and speed, then come back tomorrow for a fresh set.
- ▸New challenge every 24 hours
- ▸Same questions for all players
- ▸Score + time tracking
Daily Brief
Daily challenge: three news summaries: one has a logical error, one is missing context, one is solid. Identify which is which and explain why.
- ▸New challenge every day
- ▸Streak tracking
- ▸Pre-built scenarios, no API needed
Socratic
Examine common beliefs through Socratic questioning. Read a thesis, then identify which of four probing questions most powerfully challenges the claim.
- ▸5 chains across meritocracy, tech, democracy, speech & tradition
- ▸Reveals hidden assumptions and uncomfortable conclusions
- ▸Expected insights and follow-up questions after each round
Civic Check
Read real policy proposal summaries and identify what a bill actually does, versus what it claims, how it's commonly misread, or what its opponents say.
- ▸15 scenarios across housing, education, tech, health & energy
- ▸Fictionalized bills based on real legislative patterns
- ▸Builds policy literacy and close-reading skills
Impromptu Speaking
Draw a topic card, prep for 30 seconds, then deliver a timed 60- or 90-second speech from structure, not script. Self-rate, then get sensei feedback that calibrates your judgment against its own.
- ▸12-card deck shared with the vault S-06 gauntlet
- ▸Optional audio capture + Web Speech dictation (stays on-device)
- ▸Builds the delivery reps that gate Brown Belt
The Deck
Study rhetoric cards from the thinkers who built the craft: Aristotle, Mill, Douglass, Ostrom, Kahneman. Then drill each one until you own the move. Bring your own deck too.
- ▸Recognition, The Line & AI-graded Counter drills
- ▸Spaced repetition: mastery at 5 correct across intervals
- ▸Import your own deck JSON (stays on-device)
Real World
Practice with real-world scenarios: spot fallacies in political claims, evaluate media sources, and steelman controversial positions. Mixed-format rounds keep you sharp.
- ▸30 scenarios across fallacy spotting, source evaluation & steelmanning
- ▸Anonymized examples from AI policy, climate, healthcare & economics
- ▸Score tracking with streak counter
Tools
Analysis tools for deeper understanding of rhetoric and reasoning.
Rhetoric Analyzer
Paste any text (speech, ad, article, or social media post) and get an AI-powered breakdown of rhetorical devices, logical fallacies, and persuasion techniques with inline annotations.
- ▸Color-coded inline highlights by device type
- ▸Argument strength rating (1-10)
- ▸3 pre-loaded examples to get started
Impromptu Speaking
Draw a random topic card, prep for 30 seconds, then deliver a timed speech. Practice thinking on your feet with self-assessment and optional AI feedback on your rhetoric.
- ▸24 topics across foundations, current events & counter-arguments
- ▸30s prep + 60s or 90s speaking timer with visual countdown
- ▸Optional audio recording and AI transcript feedback
Earn your belts
Martial arts-inspired progression. Nine belts earned through mastery, never rushed. ~6 months of daily practice to reach Black Belt.
White Belt
Master 6 fallacies. Pass the White Belt Kata, a combined challenge across all game modes. Minimum score: 70%.
Yellow Belt
Master 12 fallacies. Pass the Yellow Belt Kata, a combined challenge across all game modes. Minimum score: 73%.
Orange Belt
Master 18 fallacies. Pass the Orange Belt Kata, a combined challenge across all game modes. Minimum score: 76%.
Green Belt
Master 24 fallacies. Pass the Green Belt Kata, a combined challenge across all game modes. Minimum score: 79%.
Blue Belt
Master 30 fallacies. Pass the Blue Belt Kata, a combined challenge across all game modes. Minimum score: 82%.
Purple Belt
Master 36 fallacies. Pass the Purple Belt Kata, a combined challenge across all game modes. Minimum score: 85%.
Brown Belt
Master 42 fallacies. Pass the Brown Belt Kata, a combined challenge across all game modes. Minimum score: 88%.
Red Belt
Master 46 fallacies. Pass the Red Belt Kata, a combined challenge across all game modes. Minimum score: 91%.
Black Belt
Master 50 fallacies. Pass the Black Belt Kata, a combined challenge across all game modes. Minimum score: 94%.
Free. All of it.
Every mode, every belt, every tool. No paywall, free while Dojo is in training. It's part of the Brain Mastery series, built to sharpen how you think.