| 26,219 | Animals: Largest Predators in Each U.S. State | 0 | - |
| 195 | Animals: Vertebrate...or Invertebrate? | - | - |
| 882 | Animals With the Most Rabies Cases in the US | - | - |
| 879 | Basic Positive and Negative Emotions | - | - |
| 1,574 | Bird... or Fish? | - | - |
| 583 | Branches and Areas of Mathematics | - | - |
| 170 | Cannabis Strains: Sativa... or Indica? | - | - |
| 5,390 | Causes of Death on Mount Everest | - | - |
| 560 | Citrus Fruits by Picture | - | - |
| 4,480 | Click on the Fish (Sudden Death) | - | - |
| 323 | Click the Amphibians (Sudden Death) | - | - |
| 327 | Composition of Seawater (Elements) 🌊 | - | - |
| 454 | Composition of the Human Body (Compounds/Molecules) | - | - |
| 915 | Composition of the Universe | - | - |
| 1,667 | Diseases: Contagious... or Not? | - | - |
| 97 | Diseases: Curable... or Not? | - | - |
| 1,301 | Diseases: Deadliest Infectious Diseases by Country | - | - |
| 507 | Diseases, Disorders, Conditions, or Syndromes Named After People | - | - |
| 405 | Diseases Eliminated from the US | - | - |
| 606 | Diseases That are Eradicated or Eradicable | - | - |
| 2,441 | Diseases the WHO has Declared Emergencies for 🦠 | - | - |
| 38,432 | Diseases: Virus... or Bacteria? | 0 | - |
| 138 | Dogs: Click the Correct Group 🐕 | - | - |
| 921 | Drugs that are Painkillers (Analgesic/Anesthetic Medicines) | - | - |
| 909 | Electronic Symbols of Circuit Diagrams in Engineering by Picture | - | - |
| 230 | Elements in DNA, Proteins, and Vitamins 🧬 (Sudden Death) | - | - |
| 226 | Elements Plants Need to Grow (Minerals/Nutrients) | - | - |
| 16 | Elements That Are Critical Minerals 🪨 | - | - |
| 1,149 | Essential Vitamins and Minerals (Micronutrients) | - | - |
| 775 | Famous Complexes in Psychology | - | - |
| 728 | Famous "Effects" in Science and Psychology | - | - |
| 508 | Famous Laws and Principles Named After People | - | - |
| 1,386 | Famous Syndromes (Medical and Otherwise) | - | - |
| 479 | First 12 Elements Discovered | - | - |
| 43,241 | Fish... or Not a Fish? | 0 | - |
| 601 | Four Fundamental Forces (Interactions) of Nature and Physics | - | - |
| 249 | Freud's Five Psychosexual Development Stages | - | - |
| 513 | Freud's Three Parts of the Psyche | - | - |
| 259 | Fungus and Fungi Fun Quiz 🍄 | - | - |
| 356 | Heaviest Whales 🐋 | - | - |
| 3,828 | Identify the Snakes by Picture 🐍 | - | - |
| 1,424 | Insect Groups/Orders 🪲 (Click Quiz) | - | - |
| 1,452 | Insect... or Not an Insect? | - | - |
| 230 | Insects that are "Flies" by Picture | - | - |
| 20 | Interstellar Objects in the Solar System | - | - |
| 704 | JetPunk, M.D.: Prescribe the Best Medicine 💊 | - | - |
| 145 | Locations of Deepest Places on Earth | - | - |
| 409 | Marsupials and Monotremes by Picture | - | - |
| 287 | Match the Pathogen (Virus/Bacterium) to the Disease 🦠 | - | - |
| 443 | Metals of Antiquity (Sudden Death) | - | - |
| 443 | Most Abundant Elements in the Solar System | - | - |
| 1,422 | Most Abundant Metals in Earth's Crust and the Solar System | - | - |
| 3,295 | Name That Gas! (Elements and Compounds in Chemistry) | - | - |
| 248 | Name That Gland! | - | - |
| 1,030 | Name That Liquid! (Elements, Compounds, Mixtures in Chemistry) | - | - |
| 670 | Name the Changes of State of Matter (Phase Transitions) | - | - |
| 166 | Name the Insect (by Order) | - | - |
| 13,376 | Name the Metal Alloy | 0 | - |
| 414 | Narcissistic Personality Disorder (NPD) Terminology | - | - |
| 189 | Natural and Artificial Sweeteners (Food and Nutrition) | - | - |
| 163 | Numbers... Prime or Composite? | - | - |
| 94 | Probes Leaving the Solar System | - | - |
| 14,653 | Recommended Childhood Vaccines for Americans | 0 | - |
| 235 | Regular Convex Polyhedrons (by Picture) | - | - |
| 144 | Regular Convex Polyhedrons (Platonic Solids) | - | - |
| 1,380 | Reptile... or Amphibian? | - | - |
| 607 | Skin Conditions (Yay!) | - | - |
| 364 | States of Matter (Phases of Matter) | - | - |
| 389 | The 7 Groups of Dogs | - | - |
| 161 | The Five Types of... | - | - |
| 728 | The Four Types of... | - | - |
| 153 | The “New Big Five” Animals | - | - |
| 1,354 | The Three Types of... | - | - |
| 651 | The Two Types of... | - | - |
| 206 | Trees by Picture of Leaf | - | - |
| 275 | Types of Cancer by Awareness Ribbon Color | - | - |
| 190 | Types of Fungus and Fungi by Picture | - | - |
| 237 | Types of Jellyfish by Picture | - | - |
| 710 | Types of Planets | - | - |
| 565 | Venomous Snakes of the USA 🐍 | - | - |
| 185 | Vitamin Names 💊 (Click Quiz) | - | - |
| 182 | Vitamins: Water-Soluble or Fat-Soluble? | - | - |
| 120 | Which Animal Laid the Egg? 🥚 | - | - |
| 331 | Words for Numbers | - | - |
| 69 | Worms by Picture 🪱 | - | - |
