| 26,418 | Animals: Largest Predators in Each U.S. State | 0 | - |
| 207 | Animals: Vertebrate...or Invertebrate? | - | - |
| 893 | Animals With the Most Rabies Cases in the US | - | - |
| 885 | Basic Positive and Negative Emotions | - | - |
| 1,607 | Bird... or Fish? | - | - |
| 602 | Branches and Areas of Mathematics | - | - |
| 174 | Cannabis Strains: Sativa... or Indica? | - | - |
| 5,435 | Causes of Death on Mount Everest | - | - |
| 570 | Citrus Fruits by Picture | - | - |
| 4,558 | Click on the Fish (Sudden Death) | - | - |
| 329 | Click the Amphibians (Sudden Death) | - | - |
| 329 | Composition of Seawater (Elements) 🌊 | - | - |
| 457 | Composition of the Human Body (Compounds/Molecules) | - | - |
| 920 | Composition of the Universe | - | - |
| 1,710 | Diseases: Contagious... or Not? | - | - |
| 117 | Diseases: Curable... or Not? | - | - |
| 1,320 | Diseases: Deadliest Infectious Diseases by Country | - | - |
| 513 | Diseases, Disorders, Conditions, or Syndromes Named After People | - | - |
| 410 | Diseases Eliminated from the US | - | - |
| 617 | Diseases That are Eradicated or Eradicable | - | - |
| 2,472 | Diseases the WHO has Declared Emergencies for 🦠 | - | - |
| 38,709 | Diseases: Virus... or Bacteria? | 0 | - |
| 150 | Dogs: Click the Correct Group 🐕 | - | - |
| 933 | Drugs that are Painkillers (Analgesic/Anesthetic Medicines) | - | - |
| 924 | Electronic Symbols of Circuit Diagrams in Engineering by Picture | - | - |
| 234 | Elements in DNA, Proteins, and Vitamins 🧬 (Sudden Death) | - | - |
| 227 | Elements Plants Need to Grow (Minerals/Nutrients) | - | - |
| 18 | Elements That Are Critical Minerals 🪨 | - | - |
| 10 | Micronutrients: Minerals (Sudden Death) | - | - |
| 1,165 | Essential Vitamins and Minerals (Micronutrients) | - | - |
| 786 | Famous Complexes in Psychology | - | - |
| 748 | Famous "Effects" in Science and Psychology | - | - |
| 514 | Famous Laws and Principles Named After People | - | - |
| 1,429 | Famous Syndromes (Medical and Otherwise) | - | - |
| 479 | First 12 Elements Discovered | - | - |
| 43,503 | Fish... or Not a Fish? | 0 | - |
| 606 | Four Fundamental Forces (Interactions) of Nature and Physics | - | - |
| 254 | Freud's Five Psychosexual Development Stages | - | - |
| 516 | Freud's Three Parts of the Psyche | - | - |
| 261 | Fungus and Fungi Fun Quiz 🍄 | - | - |
| 359 | Heaviest Whales 🐋 | - | - |
| 3,888 | Identify the Snakes by Picture 🐍 | - | - |
| 1,455 | Insect Groups/Orders 🪲 (Click Quiz) | - | - |
| 1,467 | Insect... or Not an Insect? | - | - |
| 233 | Insects that are "Flies" by Picture | - | - |
| 22 | Interstellar Objects in the Solar System | - | - |
| 766 | JetPunk, M.D.: Prescribe the Best Medicine 💊 | - | - |
| 148 | Locations of Deepest Places on Earth | - | - |
| 419 | Marsupials and Monotremes by Picture | - | - |
| 302 | Match the Pathogen (Virus/Bacterium) to the Disease 🦠 | - | - |
| 447 | Metals of Antiquity (Sudden Death) | - | - |
| 445 | Most Abundant Elements in the Solar System | - | - |
| 1,428 | Most Abundant Metals in Earth's Crust and the Solar System | - | - |
| 3,377 | Name That Gas! (Elements and Compounds in Chemistry) | - | - |
| 252 | Name That Gland! | - | - |
| 1,057 | Name That Liquid! (Elements, Compounds, Mixtures in Chemistry) | - | - |
| 678 | Name the Changes of State of Matter (Phase Transitions) | - | - |
| 167 | Name the Insect (by Order) | - | - |
| 13,753 | Name the Metal Alloy | 0 | - |
| 420 | Narcissistic Personality Disorder (NPD) Terminology | - | - |
| 192 | Natural and Artificial Sweeteners (Food and Nutrition) | - | - |
| 175 | Numbers... Prime or Composite? | - | - |
| 99 | Probes Leaving the Solar System | - | - |
| 14,718 | Recommended Childhood Vaccines for Americans | 0 | - |
| 238 | Regular Convex Polyhedrons (by Picture) | - | - |
| 145 | Regular Convex Polyhedrons (Platonic Solids) | - | - |
| 1,393 | Reptile... or Amphibian? | - | - |
| 612 | Skin Conditions (Yay!) | - | - |
| 370 | States of Matter (Phases of Matter) | - | - |
| 394 | The 7 Groups of Dogs | - | - |
| 165 | The Five Types of... | - | - |
| 733 | The Four Types of... | - | - |
| 155 | The “New Big Five” Animals | - | - |
| 1,369 | The Three Types of... | - | - |
| 656 | The Two Types of... | - | - |
| 219 | Trees by Picture of Leaf | - | - |
| 277 | Types of Cancer by Awareness Ribbon Color | - | - |
| 194 | Types of Fungus and Fungi by Picture | - | - |
| 239 | Types of Jellyfish by Picture | - | - |
| 717 | Types of Planets | - | - |
| 578 | Venomous Snakes of the USA 🐍 | - | - |
| 202 | Vitamin Names 💊 (Click Quiz) | - | - |
| 185 | Vitamins: Water-Soluble or Fat-Soluble? | - | - |
| 127 | Which Animal Laid the Egg? 🥚 | - | - |
| 334 | Words for Numbers | - | - |
| 72 | Worms by Picture 🪱 | - | - |
