📖 What Is an Abacus?
The Chinese abacus — called suanpan (算盘, "calculating tray") — has been used for over 2,000 years. Long before electronic calculators, merchants, scholars, and engineers performed complex arithmetic by sliding beads along rods. Even today, skilled abacus users can calculate faster than someone typing on a calculator!
🎯 Objective
Manipulate the beads on the abacus to display the target number shown at the top of the screen. Complete 15 rounds of increasing difficulty. Answer each round as quickly as possible — speed earns bonus points!
🔢 How Bead Values Work
Each column on the abacus represents a decimal place (units, tens, hundreds, thousands). Each column is divided into two decks:
- Upper Deck (Heaven Beads): 2 beads per column. Each bead pushed DOWN to the crossbar = value 5.
- Lower Deck (Earth Beads): 5 beads per column. Each bead pushed UP to the crossbar = value 1.
Formula per column: (Heaven beads × 5) + (Earth beads × 1) = Column value
Examples for a single column:
- 0 = 0 heaven + 0 earth
- 3 = 0 heaven + 3 earth
- 5 = 1 heaven + 0 earth
- 7 = 1 heaven + 2 earth
- 8 = 1 heaven + 3 earth
- 9 = 1 heaven + 4 earth
🎲 How to Play
- Read the target: A number appears at the top of the screen.
- Set columns: From right to left, each column represents units, tens, hundreds, thousands, etc.
- Click heaven beads: Click a top bead to push it down toward the crossbar (adds 5 to that column). Click again to return it.
- Click earth beads: Click bottom beads to push them up toward the crossbar (adds 1 each). Click again to return them.
- Verify visually: The current total for each column is displayed below the abacus.
- Submit: When the abacus shows the correct number, click Submit to score points and advance to the next round.
📑 Number Examples
Example: Display 3,728
- Thousands (3): 0 heaven (0) + 3 earth (3) = 3
- Hundreds (7): 1 heaven (5) + 2 earth (2) = 7
- Tens (2): 0 heaven (0) + 2 earth (2) = 2
- Units (8): 1 heaven (5) + 3 earth (3) = 8
Result: 3,728 ✓
Example: Display 59
- Tens (5): 1 heaven (5) + 0 earth (0) = 5
- Units (9): 1 heaven (5) + 4 earth (4) = 9
Result: 59 ✓
💡 Quick Rule: Never use more than 1 heaven bead per column (values 0-4 use earth only, values 5-9 use 1 heaven + some earth).
🎮 Game Modes
- 🔢 Number Mode (Rounds 1-5): Match the displayed number on the abacus. Simple and educational. Great for learning bead values.
- ➕ Equation Mode (Rounds 6-10): Solve arithmetic problems — for example, "234 + 189" — and display the RESULT on the abacus. Tests both calculation and bead manipulation skills.
- ⚡ Speed Mode (Rounds 11-15): Numbers change to larger values (up to 6 digits). The 30-second per-round timer tightens to 20 seconds. Tests your abacus fluency under pressure!
🏆 Scoring System
- Base points per correct answer: +100 points
- Time bonus: max(0, 30 − secondsTaken) × 2 bonus points — faster answers earn more!
- Skip penalty: −20 points if you skip a round
- Perfect round bonus: Complete a round in under 5 seconds for an extra +50 bonus
🌟 Pro Tips & Strategies
🚀 Tip 1: Use the Heaven Bead First
For any number 5 or above, click the heaven bead FIRST, then add earth beads. This mental shortcut is faster than counting up. For 7: think "5 + 2" not "1 + 2 + 3 + 4 + 5 + 6 + 7."
📈 Tip 2: Pre-Position for Speed Mode
Your mouse should hover near the heaven bead row since it's used for all digits 5-9. In speed rounds with large numbers (like 789,456), you'll need heaven beads on almost every column.
🧮 Tip 3: Read Left to Right
Set the most significant digit (leftmost column) first, then work rightward. This mirrors how you read numbers and helps avoid column confusion on 5-6 digit numbers.
🎯 Tip 4: Equation Mode Shortcut
For 234 + 189, you CAN calculate mentally first (423), then set the beads. But you can also set 234 first, then ADD 189 by manipulating beads directly. The second method is how real abacus users do it — and it's faster!
❓ FAQ
Q: I'm stuck on a round. Can I skip it?
Yes, the Skip button lets you bypass a round with a -20 point penalty. It's better to skip a hard round and keep moving than to waste time struggling.
Q: Do I need math skills to play?
Basic arithmetic helps for Equation Mode, but Number Mode only requires you to match a display. The game teaches you as you go — many players find their mental math improves after just a few games!
Slide some beads and solve the enigma!