| 26,549 | Animals: Largest Predators in Each U.S. State | 0 | - |
| 224 | Animals: Vertebrate...or Invertebrate? | - | - |
| 897 | Animals With the Most Rabies Cases in the US | - | - |
| 893 | Basic Positive and Negative Emotions | - | - |
| 1,628 | Bird... or Fish? | - | - |
| 611 | Branches and Areas of Mathematics | - | - |
| 177 | Cannabis Strains: Sativa... or Indica? | - | - |
| 5,468 | Causes of Death on Mount Everest | - | - |
| 577 | Citrus Fruits by Picture | - | - |
| 4,622 | Click on the Fish (Sudden Death) | - | - |
| 337 | Click the Amphibians (Sudden Death) | - | - |
| 332 | Composition of Seawater (Elements) 🌊 | - | - |
| 461 | Composition of the Human Body (Compounds/Molecules) | - | - |
| 926 | Composition of the Universe | - | - |
| 1,732 | Diseases: Contagious... or Not? | - | - |
| 131 | Diseases: Curable... or Not? | - | - |
| 1,335 | Diseases: Deadliest Infectious Diseases by Country | - | - |
| 520 | Diseases, Disorders, Conditions, or Syndromes Named After People | - | - |
| 413 | Diseases Eliminated from the US | - | - |
| 626 | Diseases That are Eradicated or Eradicable | - | - |
| 2,501 | Diseases the WHO has Declared Emergencies for 🦠 | - | - |
| 38,960 | Diseases: Virus... or Bacteria? | 0 | - |
| 163 | Dogs: Click the Correct Group 🐕 | - | - |
| 956 | Drugs that are Painkillers (Analgesic/Anesthetic Medicines) | - | - |
| 937 | Electronic Symbols of Circuit Diagrams in Engineering by Picture | - | - |
| 250 | Elements in DNA, Proteins, and Vitamins 🧬 (Sudden Death) | - | - |
| 227 | Elements Plants Need to Grow (Minerals/Nutrients) | - | - |
| 19 | Elements That Are Critical Minerals 🪨 | - | - |
| 18 | Micronutrients: Minerals (Sudden Death) | - | - |
| 1,205 | Vitamins and Minerals (Micronutrients) | - | - |
| 791 | Famous Complexes in Psychology | - | - |
| 769 | Famous "Effects" in Science and Psychology | - | - |
| 521 | Famous Laws and Principles Named After People | - | - |
| 1,475 | Famous Syndromes (Medical and Otherwise) | - | - |
| 481 | First 12 Elements Discovered | - | - |
| 43,749 | Fish... or Not a Fish? | 0 | - |
| 607 | Four Fundamental Forces (Interactions) of Nature and Physics | - | - |
| 257 | Freud's Five Psychosexual Development Stages | - | - |
| 520 | Freud's Three Parts of the Psyche | - | - |
| 262 | Fungus and Fungi Fun Quiz 🍄 | - | - |
| 361 | Heaviest Whales 🐋 | - | - |
| 3,944 | Identify the Snakes by Picture 🐍 | - | - |
| 1,497 | Insect Groups/Orders 🪲 (Click Quiz) | - | - |
| 1,475 | Insect... or Not an Insect? | - | - |
| 236 | Insects that are "Flies" by Picture | - | - |
| 23 | Interstellar Objects in the Solar System | - | - |
| 871 | JetPunk, M.D.: Prescribe the Best Medicine 💊 | - | - |
| 149 | Locations of Deepest Places on Earth | - | - |
| 603 | Marsupials and Monotremes by Picture | - | - |
| 339 | Match the Virus or Bacterium to the Disease 🦠 | - | - |
| 455 | Metals of Antiquity (Sudden Death) | - | - |
| 450 | Most Abundant Elements in the Solar System | - | - |
| 1,438 | Most Abundant Metals in Earth's Crust and the Solar System | - | - |
| 3,438 | Name That Gas! (Elements and Compounds in Chemistry) | - | - |
| 255 | Name That Gland! | - | - |
| 1,079 | Name That Liquid! (Elements, Compounds, Mixtures in Chemistry) | - | - |
| 688 | Name the Changes of State of Matter (Phase Transitions) | - | - |
| 172 | Name the Insect (by Order) | - | - |
| 14,059 | Name the Metal Alloy | 0 | - |
| 425 | Narcissistic Personality Disorder (NPD) Terminology | - | - |
| 195 | Natural and Artificial Sweeteners (Food and Nutrition) | - | - |
| 180 | Numbers... Prime or Composite? | - | - |
| 102 | Probes Leaving the Solar System | - | - |
| 14,775 | Recommended Childhood Vaccines for Americans | 0 | - |
| 239 | Regular Convex Polyhedrons (by Picture) | - | - |
| 145 | Regular Convex Polyhedrons (Platonic Solids) | - | - |
| 1,396 | Reptile... or Amphibian? | - | - |
| 616 | Skin Conditions (Yay!) | - | - |
| 371 | States of Matter (Phases of Matter) | - | - |
| 396 | The 7 Groups of Dogs | - | - |
| 177 | The Five Types of... | - | - |
| 744 | The Four Types of... | - | - |
| 158 | The “New Big Five” Animals | - | - |
| 1,382 | The Three Types of... | - | - |
| 665 | The Two Types of... | - | - |
| 231 | Trees by Picture of Leaf | - | - |
| 280 | Types of Cancer by Awareness Ribbon Color | - | - |
| 194 | Types of Fungus and Fungi by Picture | - | - |
| 244 | Types of Jellyfish by Picture | - | - |
| 720 | Types of Planets | - | - |
| 588 | Venomous Snakes of the USA 🐍 | - | - |
| 207 | Vitamin Names 💊 (Click Quiz) | - | - |
| 185 | Vitamins: Water-Soluble or Fat-Soluble? | - | - |
| 132 | Which Animal Laid the Egg? 🥚 | - | - |
| 335 | Words for Numbers | - | - |
| 73 | Worms by Picture 🪱 | - | - |
