Allows users to review questions, answers, and rationale across all subjects. Track personal performance rankings and statistics. Customize testing by subject or use adaptive learning.
Solve puzzles to an antique shop. Tap to interact with objects and move using bottom arrows. Auto-save progress and adjust volume. Watch videos or ads for puzzle hints. Select collected items by tapping.
Reference allows users to select between mass spectrometry, energy-dispersive x-ray spectroscopy, or nuclear magnetic resonance spectroscopy tables. Clicking on elements shows method-specific information about stable isotopes.
