| 25,075 | Animals: Largest Predators in Each U.S. State | 0 | - |
| 134 | Animals: Vertebrate...or Invertebrate? | - | - |
| 791 | Animals with Most Rabies Cases in the USA | - | - |
| 825 | Basic Positive and Negative Emotions | - | - |
| 1,396 | Bird... or Fish? | - | - |
| 480 | Branches and Areas of Mathematics | - | - |
| 138 | Cannabis Strains: Sativa... or Indica? | - | - |
| 5,159 | Causes of Death on Mount Everest | - | - |
| 445 | Citrus Fruits by Picture | - | - |
| 3,952 | Click on the Fish (Sudden Death) | - | - |
| 252 | Click the Amphibians (Sudden Death) | - | - |
| 279 | Composition of Seawater (Elements) 🌊 | - | - |
| 406 | Composition of the Human Body (Compounds/Molecules) | - | - |
| 862 | Composition of the Universe | - | - |
| 1,485 | Diseases: Contagious... or Not? | - | - |
| 1,176 | Diseases: Deadliest Infectious Diseases by Country | - | - |
| 429 | Diseases, Disorders, Conditions, or Syndromes Named After People | - | - |
| 357 | Diseases Eliminated from the US | - | - |
| 530 | Diseases That are Eradicated or Eradicable | - | - |
| 2,301 | Diseases the WHO has Declared Emergencies for 🦠 | - | - |
| 36,791 | Diseases: Virus... or Bacteria? | 0 | - |
| 34 | Dogs: Click the Correct Group 🐕 | - | - |
| 765 | Drugs that are Painkillers (Analgesic/Anesthetic Medicines) | - | - |
| 744 | Electronic Symbols of Circuit Diagrams in Engineering by Picture | - | - |
| 159 | Elements in DNA, Proteins, and Vitamins 🧬 (Sudden Death) | - | - |
| 205 | Elements Plants Need to Grow (Minerals/Nutrients) | - | - |
| 1,036 | Essential Vitamins and Minerals (Micronutrients) | - | - |
| 664 | Famous Complexes in Psychology | - | - |
| 581 | Famous "Effects" in Science and Psychology | - | - |
| 429 | Famous Laws and Principles Named After People | - | - |
| 1,178 | Famous Syndromes (Medical and Otherwise) | - | - |
| 438 | First 12 Elements Discovered | - | - |
| 41,442 | Fish... or Not a Fish? | 0 | - |
| 561 | Four Fundamental Forces (Interactions) of Nature and Physics | - | - |
| 227 | Freud's Five Psychosexual Development Stages | - | - |
| 488 | Freud's Three Parts of the Psyche | - | - |
| 232 | Fungus and Fungi Fun Quiz 🍄 | - | - |
| 331 | Heaviest Whales 🐋 | - | - |
| 3,487 | Identify the Snakes by Picture 🐍 | - | - |
| 1,205 | Insect Groups/Orders 🪲 (Click Quiz) | - | - |
| 1,367 | Insect... or Not an Insect? | - | - |
| 201 | Insects that are "Flies" by Picture | - | - |
| 8 | Interstellar Objects in the Solar System | - | - |
| 394 | JetPunk, M.D.: Prescribe the Best Medicine 💊 | - | - |
| 123 | Locations of Deepest Places on Earth | - | - |
| 344 | Marsupials and Monotremes by Picture | - | - |
| 171 | Match the Pathogen (Virus/Bacterium) to the Disease 🦠 | - | - |
| 324 | Metals of Antiquity (Sudden Death) | - | - |
| 367 | Most Abundant Elements in the Solar System | - | - |
| 1,291 | Most Abundant Metals in Earth's Crust and the Solar System | - | - |
| 2,628 | Name that Gas! (Elements and Compounds in Chemistry) | - | - |
| 34 | Name That Gland! | - | - |
| 590 | Name that Liquid! (Elements, Compounds, Mixtures in Chemistry) | - | - |
| 489 | Name the Changes of State of Matter (Phase Transitions) | - | - |
| 94 | Name the Insect (by Order) | - | - |
| 1,783 | Name the Metal Alloy | - | - |
| 317 | Narcissistic Personality Disorder (NPD) Terminology | - | - |
| 128 | Natural and Artificial Sweeteners (Food and Nutrition) | - | - |
| 74 | Numbers... Prime or Composite? | - | - |
| 74 | Probes Leaving the Solar System | - | - |
| 14,224 | Recommended Childhood Vaccines for Americans | 0 | - |
| 211 | Regular Convex Polyhedrons (by Picture) | - | - |
| 133 | Regular Convex Polyhedrons (Platonic Solids) | - | - |
| 1,277 | Reptile... or Amphibian? | - | - |
| 562 | Skin Conditions (Yay!) | - | - |
| 337 | States of Matter (Phases of Matter) | - | - |
| 360 | The 7 Groups of Dogs | - | - |
| 98 | The Five Types of... | - | - |
| 650 | The Four Types of... | - | - |
| 489 | The Four Venomous (aka "Poisonous") Snakes of the USA | - | - |
| 134 | The “New Big Five” Animals | - | - |
| 1,270 | The Three Types of... | - | - |
| 594 | The Two Types of... | - | - |
| 167 | Trees by Picture of Leaf | - | - |
| 249 | Types of Cancer by Awareness Ribbon Color | - | - |
| 172 | Types of Fungus and Fungi by Picture | - | - |
| 213 | Types of Jellyfish by Picture | - | - |
| 647 | Types of Planets | - | - |
| 137 | Vitamin Names 💊 (Click Quiz) | - | - |
| 170 | Vitamins: Water-Soluble or Fat-Soluble? | - | - |
| 74 | Which Animal Laid the Egg? 🥚 | - | - |
| 284 | Words for Numbers | - | - |
| 45 | Worms by Picture | - | - |
