Master Tile Efficiency, Become a Calculation Expert
Use science-backed training and AI analysis to sharpen tenpai recognition, discard decisions, and shanten calculation. Join tens of thousands of players and play with more confidence.
6
Training Modes
4
Languages
Complete
Tile Coverage
Free
Cost
Do These Mahjong Training Problems Ring a Bell?
Can't Read Complex Waits
Multi-sided waits and chinitsu hands slip by you in real games—missed wins you could have had.
Discards Based on Gut Feeling
Not sure which tile to cut, so you go with instinct—then realize you tossed your best draw.
Can't See Your Weak Spots
You practice a lot but without data tracking, you don't know what's actually holding you back.
No Structured Training Method
You've watched tutorials and played games, but there's no repeatable system to lock in your skills.
Training Modes
How It Works
3 Steps to Start Training
Train without signing up. Log in to unlock leaderboards and progress tracking.
Pick a Training Mode
Choose from 6 modes—tenpai, discard, shanten, and more—based on your level.
Solve Timed Drills
Read waits or pick discards before time runs out. Answers appear right after.
Review AI Feedback
AI shows what you got right, what you missed, and where to focus next.
Choose Your Path
Beginner or Advanced? Find Your Training
Beginners
New to tile efficiency? Start with basic wait reading and calculation to build a foundation.
- 1Tenpai Training — Build wait-reading instincts
- 2Shanten Training — Learn to evaluate hand distance
- 3Discard Training — Develop a decision framework
Advanced Players
Already have the basics? Sharpen your decision-making in complex situations.
- 1Discard Training — Master complex hand decisions
- 2One-Shanten Discard — Refine that critical last step
- 3AI Analysis — Review every hand with data
System Features
From instant feedback to global rankings—everything you need to build tile efficiency and level up your game.
Instant Smart Feedback
AI checks right or wrong and explains why—you learn what to fix and what to keep
Global Rankings
Compete with players worldwide; rankings and progress at a glance
Full Pattern Coverage
Man, pin, sou, honors—all tile types and scenarios so you’re ready for any hand
Fast Operation
Number keys to select, Enter to confirm—shortcuts keep flow smooth and focus on play
Pro Tile Efficiency Analysis
Probability and expected value, multi-strategy comparison—choose the best move for the situation
Structured Training vs. Figuring It Out
On Your Own
- Watch tutorials, forget them by next game
- Only realize mistakes after they cost you
- No idea why a discard was wrong
- Practice without focus, slow improvement
- No data, no way to measure progress
Mahjong Lab
- Targeted timed drills that stick
- Instant feedback on every question
- AI shows the optimal play with draw counts
- 6 modes covering every key skill
- Scores + leaderboards to track growth
Under the Hood
Built on Precise Algorithms, Not Guesswork
Every answer in Mahjong Lab comes from shanten algorithms and probability calculations—accurate and reliable.
Shanten Algorithm
Supports standard, seven-pairs, and thirteen-orphans forms. Calculates exact shanten in milliseconds.
Tile Efficiency Engine
Evaluates every possible discard, counts draws and effective tiles, and surfaces the best play.
Smart Problem Generator
Auto-generates drills across difficulty levels and hand patterns—no repeats, full coverage.
Multiple Languages, Every Device
Available in 4 languages with responsive design. Open a browser and start.
Language Support
Platform Support
Frequently Asked Questions
Join Tens of Thousands—Level Up Your Tile Efficiency
Start free; pick a mode and go. AI-driven training and instant feedback so every hand counts more from day one.
Start Training Now