Cryptic Coach vs Doomsday Trainer

Cryptic Coach helps you master cryptic crosswords. Learn techniques through structured lessons, practice with curated puzzles, and solve a daily clue with video explanations. Access the vault of previous daily cryptic clues and submit your own clues for potential inclusion. Everything you need to improve your cryptic solving skills. We're just getting started, so expect regular updates and new features as we grow. Come join the community and let's solve together! Terms and conditions at: https://www.crypticcoach.com/terms

Master the Doomsday Algorithm — calculate the day of the week for any date in history in seconds. PLAY Build your streak and beat the clock. Every correct answer adds to your streak; one wrong answer ends it. Compete on the global leaderboard for Longest Streak and Fastest Average Speed. BATTLE Challenge a real opponent to a live 1-on-1 race. Five dates, fastest and most accurate player wins. Elo-based ranking tracks your competitive record. TRAIN Six methods to choose from: • Doomsday — the classic anchor-day approach • Odd + 11 — the Fong-Walters mental shortcut • The Wollin Shortcut — a memory-based system using vectorized doomsdays, the Square Knot Rule, and the Wollin Calamity Table (by u/Nillows) • Conway's Method — the original algorithm by John Conway • Mod 28 — reduce any year to under 28 before calculating • Custom Mode — pick your own date range, century, or decade DRILL Targeted practice for each component: months, centuries, years, mod 7 arithmetic, and the full Wollin Shortcut drill suite. TUTORIAL New to the algorithm? The built-in tutorial walks you through everything step by step.