| 1,924,577 | Elements of the Periodic Table Quiz |
| 1,007,083 | Planets of the Solar System Quiz |
| 201,371 | Songs with Body Parts in the Title |
| 198,850 | Three Letter Body Parts Quiz |
| 194,578 | Signs of the Zodiac Quiz |
| 174,241 | Elements by Symbol Quiz |
| 168,011 | Word Scramble - Body Parts |
| 161,917 | Periodic Table Quiz - First 20 Elements |
| 139,536 | Most Common Elements in the Human Body |
| 138,717 | Body Part Words Quiz |
| 138,225 | Science General Knowledge #1 |
| 137,397 | International Scientific Units |
| 136,942 | Countries with the Most Forest |
| 119,103 | Body Part Cliches |
| 116,351 | Largest Objects in the Solar System |
| 115,347 | Medical Conditions Quiz |
| 112,747 | Element... or Pokémon? |
| 108,111 | Human Body A-Z |
| 106,274 | Organs of the Human Body (with map) |
| 96,726 | Science General Knowledge #2 |
| 95,615 | Countries with Glaciers |
| 95,111 | Countries with the Highest Carbon Dioxide Emissions |
| 90,366 | Speed Symbol by Element |
| 90,146 | "Ologies" Quiz |
| 88,189 | Medical Acronyms |
| 87,896 | Science General Knowledge #3 |
| 85,308 | Metals of Antiquity |
| 85,217 | Periodic Table Elements A-Z |
| 84,682 | Medical Specialties |
| 83,023 | Random Symbol to Element |
| 79,963 | One-Syllable Human Body Parts |
| 79,760 | Science Multiple Choice #1 |
| 77,786 | Birthstones Quiz |
| 75,859 | Chemical Elements with Short Names |
| 70,836 | Elements with One-Letter Symbols |
| 70,619 | Major Taxonomic Ranks |
| 69,214 | Tropical Rainforest Countries |
| 68,110 | Most Forested European Countries |
| 65,994 | Science Vocabulary #1 |
| 65,782 | Click the Chemical Element |
| 65,756 | Periodic Table Elements Mentioned in the Bible |
| 64,277 | Astronomy Quiz |
| 63,920 | Name a Valid Element |
| 63,426 | Elements by Picture |
| 62,080 | Scientific Names |
| 61,974 | Name the Virus |
| 61,926 | Dumb it Down Doc |
| 60,704 | Least-Forested Countries |
| 60,468 | Least Forested Countries in Asia |
| 60,112 | Worst Plastic Polluting Countries |
| 59,730 | Noble Gases |
| 59,313 | Top 10 Most Forested Countries in Asia |
| 57,837 | Animal Anatomy Quiz |
| 57,616 | Elements that are Gases at Room Temperature |
| 56,680 | Top 10 Solar Power Countries |
| 56,650 | Electromagnetic Spectrum |
| 55,916 | Periodic Table Elements by Clue #1 |
| 54,319 | Science Vocabulary #2 |
| 53,680 | Click the Planet |
| 53,292 | Medical Vocabulary |
| 52,241 | First Names of Scientists |
| 52,230 | Answers are Elements #2 |
| 51,496 | Periodic Table Symbols Quiz |
| 50,977 | Countries with the Most Forest A-Z |
| 50,803 | Answers are Elements #1 |
| 50,491 | Least Forested European Countries |
| 50,098 | Word Chain - Science |
| 48,427 | Planets By Picture Quiz |
| 48,141 | Countries by Carbon Dioxide Emissions per Capita |
| 48,100 | Countries by Change in Carbon Dioxide Emissions |
| 48,011 | Things Named For People #3 - Science |
| 47,823 | Science Vocabulary #3 |
| 47,630 | Category Elimination - Elements |
| 47,347 | Planets - Multiple Choice |
| 47,311 | Elemental Words |
| 46,641 | Most Guessed Elements on JetPunk |
| 46,029 | Groups of Two - Science |
| 44,483 | Countries with Tropical Rainforest and Glaciers |
| 42,761 | Countries with the Most HIV |
| 42,372 | Diseases and Medical Conditions A-Z |
| 41,225 | Name the Constellations Quiz |
| 40,642 | Citrus Fruits |
| 39,931 | Famous Scientists |
| 39,038 | Fish... or Not a Fish? |
| 38,390 | Solar System Trivia |
| 38,321 | Animals by Skeleton Image |
| 36,743 | Countries that Desalinate the Most Water |
| 36,194 | First 30 Elements Periodic Table |
| 36,097 | Science True or False |
| 35,332 | Countries with the Highest Percentage of Forest |
| 35,157 | Astronomy Decoder |
| 35,008 | Top 10 Least-Forested U.S. States |
| 34,419 | Diseases: Virus... or Bacteria? |
| 33,675 | Astronomy True or False |
| 33,480 | Top 10 Most-Forested U.S. States |
| 33,091 | Science Multiple Choice #2 |
| 32,766 | Body Parts in History and Culture |
| 32,243 | Countries with the Most Mangroves |
| 31,932 | Name a Valid Answer - Science |
| 31,799 | Countries with the Most Malaria Deaths |
| 31,180 | Name the Constellations - With a Map |
| 31,013 | Science Multiple Choice #3 |
| 30,891 | Bones in the Human Body |
| 30,867 | Lightest Chemical Elements A-Z |
| 29,886 | Most Common Body Part Words |
| 28,807 | The Sun Quiz |
| 27,305 | Science Decoder |
| 27,067 | Rocks and Minerals Picture Quiz |
| 25,868 | Northernmost Countries Without Glaciers |
| 25,655 | Animals - Taxonomy to Common Name |
| 25,337 | Environmental Issues |
| 23,613 | Top 10 U.S. States by Solar Power |
| 22,147 | Largest Countries Without Glaciers |
| 21,846 | Body Parts - No Vowels |
| 21,600 | U.S. States with the Most Drug Overdose Deaths |
| 21,063 | U.S. States with Glaciers |
| 19,014 | Elements Named for Countries |
| 18,401 | 16 Questions that Prove that Physics Makes No Sense |
| 17,380 | The Mars Quiz |
| 17,307 | Albert Einstein Quiz |
| 16,361 | Brightest Objects in the Sky |
| 15,395 | Click Every Chemical Symbol |
| 15,344 | The Jupiter Quiz |
| 15,058 | Bones of the Human Body (with a map) |
| 13,742 | Recommended Childhood Vaccines for Americans |
| 13,356 | Elements of the Periodic Table by Symbol |
| 13,089 | The Diseases They Had |
| 12,551 | The Voyage of Darwin - Animated Map Quiz |
| 12,088 | First 40 Elements |
| 10,762 | The Saturn Quiz |
| 9,814 | Physics Equations |
| 9,663 | Medicine and Anatomy by Letter - A |
| 9,511 | First 50 Elements |
| 9,504 | Periodic Table Elements by Clue #2 |
| 9,325 | A Quiz About Diamonds |
| 9,297 | Random Elements on the Periodic Table |
| 9,005 | Amino Acids to 1 Letter Code |
| 8,854 | The Pluto Quiz |
| 8,762 | Periodic table challenge - IN ORDER! |
| 8,631 | Random Element to Atomic Number |
| 8,407 | Simple Machines Quiz |
| 7,886 | Astronomy & Space |
| 7,734 | First 60 Elements |
| 7,488 | The Elements of the Periodic Table |
| 6,949 | Organs of the Body |
| 6,408 | First 28 Countries of Wuhan Coronavirus COVID-19 Outbreak |
| 6,382 | The Venus Quiz |
| 6,380 | Periodic Table Symbols - Sudden Death |
| 6,245 | Countries That Discovered the Elements of the Periodic Table |
| 6,004 | Science General Knowledge #1 |
| 5,929 | Click the Chemical Element #2 |
| 5,899 | Moons of the Solar System |
| 5,690 | Scientific Groups of Things #1 |
| 5,637 | Name Elements Containing Each Letter A-Z |
| 5,592 | Name the Planets* |
| 5,306 | Physics General Knowledge |
| 5,247 | Human anatomy for dummies |
| 5,113 | Periodic Table of Elements - in Order |
| 5,012 | Random Constellations on a Map |
| 4,926 | Human Skeleton |
| 4,854 | Causes of Death on Mount Everest |
| 4,646 | Astronomy General Knowledge Quiz #1 |
| 4,648 | Medicine and Anatomy by Letter - B |
| 4,557 | Constellation Map |
| 4,458 | The 8 Planets of Solar System - Map Quiz |
| 4,457 | Human Biology Multiple Choice Quiz #3 |
| 4,408 | Medication... or Pokémon? |
| 4,246 | Space and Astronomy General Knowledge |
| 4,229 | Medicine and Anatomy by Letter - C |
| 3,972 | Biology Vocabulary |
| 3,913 | Medicine and Anatomy by Letter - D |
| 3,854 | Periodic Table Quiz by Borders in 60 Seconds |
| 3,838 | Random Sequential Elements on the Periodic Table |
| 3,828 | Seven Strong Acids Quiz |
| 3,705 | Medical Terms in Groups of Three |
| 3,625 | Muscles of the Human Body |
| 3,605 | Medicine and Anatomy by Letter - F |
| 3,576 | Crossword - Elements |
| 3,528 | Elements of the Periodic Table in Alphabetical Order |
| 3,357 | Physics, Famous Physicists |
| 3,308 | Common Chemical Compounds Quiz |
| 3,276 | Parts of the Brain |
| 3,141 | Medicine and Anatomy by Letter - E |
| 3,091 | Elements of The Periodic Table - Sudden Death |
| 3,065 | Medical Terminology A-Z |
| 2,992 | Click on the Fish (Sudden Death) |
| 2,976 | Anatomy of the Human Eye Map Quiz |
| 2,923 | Science by Letter - A |
| 2,906 | Body Parts - Sudden Death |
| 2,893 | Organic chemistry functional groups |
| 2,890 | Countries with the 50 Oldest Living People |
| 2,883 | Astronomy General Knowledge Quiz #2 |
| 2,879 | -Ectomy Quiz |
| 2,878 | Uses of Greek Letter in Science and Mathematics |
| 2,854 | Category Elimination - Elements (Expert) |
| 2,842 | General Knowledge Science Quiz |
| 2,832 | Physics A-Z |
