How to Play
Learn the basics in seconds
Live Demo
Watch the shape align with the target — then tap!
How to Play
- A shape darts across the screen.
- A stationary target outline sits in the center.
- Tap the screen exactly when the moving shape aligns with the target.
- The closer the alignment at the moment of your tap, the higher your accuracy.
How Accuracy is Measured
- At the moment you tap, the system captures the exact position of the moving shape.
- It then calculates how closely the shape's outline overlaps the target outline.
- Overlap is measured using geometric distance between thousands of sampled points on both shapes.
- Perfect alignment = 100%. Even a slight miss will lower the percentage proportionally.
- You must reach the level's required accuracy threshold to advance.
The Hausdorff distance is a way to check how similar two shapes are by looking at their edges. It was created by a mathematician named Felix Hausdorff. Imagine you draw two shapes on paper.
To compare them:
- Pick a point on the edge of the first shape.
- Find the closest point on the edge of the second shape.
- Measure the distance between them.
- Do this for all points on the shape.
The Hausdorff distance is the biggest distance you find. It tells you the worst mistake between two shapes. If the shapes match perfectly, the distance is 0. If one part sticks out or is far away, the distance becomes big.
Changing & Repeating Levels
- Tap "Play Now" on the Home screen to continue from your current level.
- Visit the Levels page to pick any unlocked level and replay it to improve your score.
- Each level increases speed and/or shape complexity.
App Features
- Analytics — view charts of your accuracy, reaction time, and level progress over time.
- Leaderboard — see how you rank against all players globally.
- Shop — spend coins earned from matches to unlock new visual themes.
- Challenges — create a personal challenge link and send it to friends to beat your score.
- Premium — removes ads, enables custom shape uploads, and unlocks unlimited attempts.
How to Earn Coins
- Successful Matches: Every time you successfully match a shape with its target, you earn coins.
- Combos: Achieve high accuracy (95%+) consistently to trigger combo multipliers, which significantly increase the number of coins awarded per match.
- Level Clear: Clearing a level grants a bonus coin reward.
- Achievements: Check the Achievements section in your profile to see specific milestones that reward extra coins.
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1
Highest Level
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Best Time
0
Successful Matches
0
Games Played
Achievements0/10
First Win
Complete 10 successful matches.
Level 5
Reach level 5.
Combo 5
Achieve a combo of 5.
Lightning Fast
Reaction time under 200ms.
50 Wins
Complete 50 successful matches.
Level 10
Reach level 10.
Combo 10
Achieve a combo of 10.
Level 20
Reach level 20.
100 Wins
Complete 100 successful matches.
Ultra Fast
Reaction time under 100ms.
Match History (Last 0)
No games played yet
Tap when aligned
Unlock Features
Refer a Friend
25Invite a friend and get 25 coins when they sign up!
My Custom Shapes
Create your own shapes from images! You can save up to 3 custom shapes.
Ad-Free Experience
Play without interruptions! Removes interstitial and rewarded ads for 3 days (banner ads remain).
Themes
🎮 Default
Classic neon cyan aesthetics.
🟢 Neon Green
Vibrant matrix-style green.
🔥 Sunset
Warm orange and fiery red tones.
🌊 Ocean
Deep blue and aquatic vibes.
🌌 Galaxy
Mystical purple and cosmic energy.
✨ Gold
Luxurious golden sparkles.
Step 1 of 4
Welcome to Gozpadi
Test your reflexes and climb the leaderboard.