Game Rules & How Scoring Works
Every set consists of 5 interactive rounds. In each round, an object from the selected world is presented alongside its target measurement (such as diameter, length, or height).
- Step 1: The Guess Phase – Use the slider and fine-tuning (+/-) buttons to set your estimate in millimeters or centimeters. Pressing "Pakka!" locks in your guess.
- Step 2: Bonus Measurement – If you possess the physical object (such as a coin, battery, or card) and it fits on your screen, you can place it directly over your calibrated display and drag the marker jaws for bonus points.
- Step 3: Reveal & Scoring – The exact dimension is shown alongside your estimate. High accuracy yields up to 100 points per round plus combo multipliers (up to 1.3x) for consecutive good guesses.
- Step 4: Stars & XP – Finish 5 rounds to calculate your set score, earn up to 3 stars, gain XP, and unlock subsequent worlds.
Screen Calibration Reminder
To ensure that screen measurements and bonus rounds correspond to genuine physical dimensions, make sure your screen is calibrated. Calibration uses an ISO/IEC 7810 credit card (85.6 mm length). You can recalibrate anytime via the Settings or Ruler pages.