Cipher vs Doomsday Trainer

Do you love a treasure hunt?  Do you love secret messages?  Do you enjoy decoding and encoding messages? With "CIPHER" you can easily encode and decode messages. At the beginning, there are 12 different secret codes (e.g. Morse alphabet, Braille, ...) available, more codes will follow in free updates. All functions and worksheets do not need an internet connection! ENCODING With the keyboard, letters and numbers can be typed in plain text and converted into symbols. The encoded messages can be saved and exported as an image. Various applications: treasure hunts, puzzle tasks for school, children's birthday parties, encoded postcards or just for fun! DECODING WITH THE APP By using the symbol keyboard, the message can be easily decoded in the app. When tapping on the symbols, the corresponding letter or number is displayed. DECODING WITH THE PRINTABLE TRANSLATION TABLE The translation tables can be exported and printed as PDF worksheet. With these worksheets, the encoded messages can be decoded even without an app or the Internet. *** NOTE *** This app contains a part of "CacheToolBox". The printable translation tables will be available only in this app, also in the future! More fonts will follow later, some of them are only available here! "Cipher" is addressed to a different target group like schools, scouts, etc.

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.