Doomsday Trainer

Inefficient Code

About this game

Can you figure out that March 15, 1937 was a Monday — in under 5 seconds?

Doomsday Trainer — Name Any Day in Your Head teaches you the mental calendar calculation techniques used by competitive memory athletes and calendar savants. Start slow, build the skill, then race the clock.

🎮 THE GAME
Every round, you're shown a random date from across the centuries. Your goal: name the correct day of the week as fast as possible.

• Build Your Streak: Answer correctly and your streak grows. Answer wrong and it's over.
• Beat the Clock: A countdown timer keeps the pressure on, getting tighter the longer your streak runs.

Build the longest streak. Set the fastest average speed. Climb the global rankings.

🧠 FIVE METHODS TO MASTER
Not everyone thinks the same way. Doomsday Trainer teaches five proven calculation techniques, each with its own step-by-step training mode:

• Doomsday: The classic anchor-date method used by world memory champions.
• Wollin Shortcut: A two-part system using vectorized Doomsday codes and Doomyear sequences for lightning-fast results.
• Odd + 11: An elegant carry-free approach with no multiplication.
• Mod 28: Subtract chunks of 28, count leaps, done.
• Conway: Dozens, remainder, and leaps in one smooth pass.

Training mode walks you through every calculation step-by-step, featuring progressive hints, a full reference Databank, and a built-in Wollin lookup table.

🎯 FOCUSED DRILLS
Isolate the parts that slow you down. Eight targeted drill modes sharpen the individual skills that feed into every calculation:

• Month Anchors
• Century Anchors
• Year Offset
• Modulo 7
• Add / Subtract
• Times Tables
• The Wollin Shortcut
• Leap Year Detection

Track your progress across every drill category with detailed accuracy breakdowns and improvement charts.

⚔️ BATTLE REAL OPPONENTS
Challenge players around the world in real-time 1v1 Best-of-5 matches.

• Fair Competition: Both players receive identical dates (same seed, same sequence), so the result is pure speed and accuracy.
• Ghost Matchmaking: No live opponent online? The game instantly matches you with a ghost recording of a real player from your skill range.
• Rank Up: Earn Elo rating and climb the competitive 1v1 leaderboard.

🌍 GLOBAL LEADERBOARDS
Compete for the top of two global rankings. Your scores sync automatically so you can see exactly where you stand worldwide.

• Longest Streak: How many correct answers in a row can you get?
• Fastest Speed: What's your best average over 5 consecutive answers?

📈 TRACK YOUR PROGRESS
• Speed and accuracy charts for the past 7 days, 30 days, or full year.
• Personal best streak and speed records.
• Training and drill completion history.
• Full game-by-game breakdown.

✨ FEATURES
• Multiple visual themes to customize your experience.
• Adjustable font size and layout options.
• Full coverage of edge cases, including leap year handling and century shifts.

Whether you're a memory sports competitor, a maths enthusiast, or just someone who wants a genuinely unusual party trick — Doomsday Trainer will get you there.

What’s new

New in v6.0.8: Various bug fixes