QuestionKey

Question Key is a playful educational science mystery game that teaches players to think like real scientists. Instead of guessing an answer, players make predictions, run experiments, observe results, and use evidence to solve each mystery. Read the question and examine both possible answers. Choose a scientific testing tool and predict how Answer A and Answer B should react. Run the experiment, watch what happens, study the evidence, and select the supported answer. Every level includes three testing tools, but only one provides decisive evidence. Choose carefully—the fewer experiments you use, the more keys you earn! Explore 10 handcrafted science mysteries. Discover a hidden magnet, identify unknown materials, test floating objects, investigate a silent toy, examine a bending plant, diagnose a mini drone, and solve other interactive scientific puzzles. FEATURES: • 10 handcrafted science mystery levels • Interactive experiments and animated results • Prediction-based puzzle gameplay • Evidence-driven answers instead of guessing • Three scientific tools in every level • Earn up to 3 keys per mystery • Collect a total of 30 keys • Guided interactive Level 1 tutorial • Colorful child-friendly artwork • Original sound effects • No time pressure • Retry predictions without restarting • Single-player and playable offline Question Key rewards curiosity, observation, logical thinking, and scientific reasoning. Can you find the key experiment and prove every answer?