Logic Thread

Master reasoning by playing. Logic Thread is a free, Duolingo-style game that trains clear thinking from the ground up — climbing the Citadel of Reason, tower by tower, from simply noticing things clearly all the way to LSAT-grade argument under pressure.

Sage's Gauntlet

Every day, Sage the owl offers a brand-new timed Gauntlet: a race through reasoning puzzles pitched to how far you've climbed. Score 90% or better and beat the clock to win 50 Insight — the coin of the whole climb.

The fifteen towers

The Listening Garden (attention and exact words), the Hall of Statements (truth, NOT, all/some, AND/OR), the Gate of If (conditionals), the Mirror Maze (the contrapositive and its traps), the Argument Forge (premises and conclusions), the Vault of Assumptions, the Rogues' Gallery and the Masquerade (logical fallacies), the Causeway (correlation vs causation), the Scales of Evidence, the Reading Room, the Inference Engine (formal logic), the Observatory of Chance (probability and Bayesian updating), the Strategist's Loft (mental models), and the Court of Light (LSAT-style flaw, assumption, strengthen/weaken, inference, principle and parallel reasoning).

Short, friendly lessons with instant feedback. Boss battles against each tower's Keeper. An adaptive spaced-repetition engine that keeps mastered skills from fading. Hearts, streaks, levels and badges. Chat with AI recreations of history's great reasoners at the Symposium — Aristotle, Socrates, Bacon, Bayes, Boole, Popper, Kahneman and more. Earn Insight with your guide, Sage the owl. Works offline and installs to your home screen. No account needed. Sister project to Science Thread, Math Thread, English Thread and History Thread.