| Taken | Quiz |
|---|
| 1,659,283 | Elements of the Periodic Table Quiz |
| 931,838 | Planets of the Solar System Quiz |
| 190,105 | Three Letter Body Parts Quiz |
| 184,089 | Songs with Body Parts in the Title |
| 182,832 | Signs of the Zodiac Quiz |
| 155,048 | Elements by Symbol Quiz |
| 150,811 | Word Scramble - Body Parts |
| 133,024 | Periodic Table Quiz - First 20 Elements |
| 130,314 | Body Part Words Quiz |
| 126,179 | Countries with the Most Forest |
| 122,343 | Science General Knowledge #1 |
| 115,226 | Body Part Cliches |
| 114,460 | Most Common Elements in the Human Body |
| 112,666 | International Scientific Units |
| 107,225 | Medical Conditions Quiz |
| 99,534 | Human Body A-Z |
| 94,968 | Organs of the Human Body (with map) |
| 89,384 | Countries with the Highest Carbon Dioxide Emissions |
| 88,022 | Largest Objects in the Solar System |
| 86,080 | Science General Knowledge #2 |
| 83,259 | "Ologies" Quiz |
| 82,694 | Element... or Pokémon? |
| 80,945 | Medical Acronyms |
| 79,830 | Speed Symbol by Element |
| 77,943 | Medical Specialties |
| 73,785 | One-Syllable Human Body Parts |
| 72,948 | Countries with Glaciers |
| 72,742 | Science Multiple Choice #1 |
| 72,561 | Science General Knowledge #3 |
| 70,712 | Chemical Elements with Short Names |
| 65,842 | Periodic Table Elements A-Z |
| 64,421 | Tropical Rainforest Countries |
| 64,039 | Metals of Antiquity |
| 63,832 | Random Symbol to Element |
| 60,783 | Major Taxonomic Ranks |
| 60,644 | Most Forested European Countries |
| 59,839 | Science Vocabulary #1 |
| 59,087 | Scientific Names |
| 58,060 | Dumb it Down Doc |
| 57,637 | Name the Virus |
| 58,155 | Periodic Table Elements Mentioned in the Bible |
| 55,774 | Animal Anatomy Quiz |
| 55,413 | Least Forested Countries in Asia |
| 54,861 | Astronomy Quiz |
| 54,629 | Noble Gases |
| 54,228 | Top 10 Most Forested Countries in Asia |
| 53,837 | Worst Plastic Polluting Countries |
| 53,269 | Elements with One-Letter Symbols |
| 51,693 | Top 10 Solar Power Countries |
| 48,904 | Least-Forested Countries |
| 48,804 | Answers are Elements #2 |
| 48,419 | Science Vocabulary #2 |
| 48,331 | Answers are Elements #1 |
| 47,785 | First Names of Scientists |
| 47,196 | Countries by Carbon Dioxide Emissions per Capita |
| 47,107 | Medical Vocabulary |
| 46,941 | Click the Chemical Element |
| 46,700 | Least Forested European Countries |
| 46,450 | Elements that are Gases at Room Temperature |
| 45,840 | Countries with the Most Forest A-Z |
| 45,212 | Periodic Table Elements by Clue |
| 44,480 | Countries by Change in Carbon Dioxide Emissions |
| 43,268 | Name a Valid Element |
| 43,240 | Groups of Two - Science |
| 43,210 | Science Vocabulary #3 |
| 43,060 | Electromagnetic Spectrum |
| 42,844 | Elements by Picture |
| 42,290 | Elemental Words |
| 40,744 | Category Elimination - Elements |
| 40,705 | Countries with Tropical Rainforest and Glaciers |
| 40,537 | Click the Planet |
| 39,750 | Planets By Picture Quiz |
| 39,686 | Citrus Fruits |
| 39,589 | Countries with the Most HIV |
| 37,532 | Famous Scientists |
| 37,526 | Name the Constellations Quiz |
| 37,217 | Diseases and Medical Conditions A-Z |
| 36,580 | Most Guessed Elements on JetPunk |
| 36,493 | Word Chain - Science |
| 36,025 | Periodic Table Symbols Quiz |
| 35,985 | Things Named For People #3 - Science |
| 35,642 | Metals by Total Mined Value |
| 33,798 | Fish... or Not a Fish? |
| 31,982 | Science True or False |
| 31,799 | Countries with the Highest Percentage of Forest |
| 31,654 | Top 10 Least-Forested U.S. States |
| 31,405 | Top 10 Most-Forested U.S. States |
| 30,768 | Planets - Multiple Choice |
| 30,749 | Animals by Skeleton Image |
| 30,673 | Astronomy True or False |
| 30,499 | Solar System Trivia |
| 30,418 | Diseases: Virus... or Bacteria? |
| 30,003 | Science Multiple Choice #2 |
| 30,080 | Body Parts in History and Culture |
| 29,566 | Countries with the Most Mangroves |
| 29,559 | Countries with the Most Malaria Deaths |
| 28,822 | Bones in the Human Body |
| 28,663 | First 30 Elements Periodic Table |
| 27,879 | Most Common Body Part Words |
| 27,493 | Science Multiple Choice #3 |
| 26,366 | Astronomy Decoder |
| 26,352 | Name the Constellations - With a Map |
| 24,869 | Lightest Chemical Elements A-Z |
| 24,675 | Science Decoder |
| 24,124 | Rocks and Minerals Picture Quiz |
| 23,677 | Environmental Issues |
| 22,988 | Name a Valid Answer - Science |
| 22,904 | The Sun Quiz |
| 22,354 | Animals - Taxonomy to Common Name |
| 20,009 | U.S. States with the Most Drug Overdose Deaths |
| 20,012 | Countries that Desalinate the Most Water |
| 18,421 | Body Parts - No Vowels |
| 16,691 | Northernmost Countries Without Glaciers |
| 16,272 | U.S. States with Glaciers |
| 15,817 | 16 Questions that Prove that Physics Makes No Sense |
| 15,574 | The Mars Quiz |
| 14,582 | Brightest Objects in the Sky |
| 12,713 | Largest Countries Without Glaciers |
| 12,662 | Elements of the Periodic Table by Symbol |
| 12,435 | Recommended Childhood Vaccines for Americans |
| 12,055 | The Diseases They Had |
| 11,926 | Top 10 U.S. States by Solar Power |
| 11,360 | Albert Einstein Quiz |
| 10,150 | The Voyage of Darwin - Animated Map Quiz |
| 10,096 | The Jupiter Quiz |
| 9,626 | Click Every Chemical Symbol |
| 9,461 | The Saturn Quiz |
| 9,026 | Physics Equations |
| 8,424 | Periodic table challenge - IN ORDER! |
| 8,736 | Bones of the Human Body (with a map) |
| 7,952 | Random Element to Atomic Number |
| 7,592 | Simple Machines Quiz |
| 7,530 | Amino Acids to 1 Letter Code |
| 7,296 | Astronomy & Space |
| 7,294 | The Pluto Quiz |
| 7,228 | The Elements of the Periodic Table |
| 6,539 | Organs of the Body |
| 6,482 | Medicine and Anatomy by Letter - A |
| 6,416 | Random Elements on the Periodic Table |
| 6,089 | First 28 Countries of Wuhan Coronavirus COVID-19 Outbreak |
| 5,736 | The Venus Quiz |
| 5,565 | Moons of the Solar System |
| 5,356 | Science General Knowledge #1 |
| 5,034 | First 50 Elements |
| 4,963 | First 60 Elements |
| 4,710 | Physics General Knowledge |
| 4,448 | Scientific Groups of Things #1 |
| 4,446 | Name the Planets* |
| 4,389 | Countries That Discovered the Elements of the Periodic Table |
| 4,372 | Click the Chemical Element #2 |
| 4,328 | First 40 Elements |
| 4,092 | Astronomy General Knowledge Quiz #1 |
| 4,010 | Random Constellations on a Map |
| 3,792 | Space and Astronomy General Knowledge |
| 3,749 | Human Skeleton |
| 3,541 | Seven Strong Acids Quiz |
| 3,529 | Biology Vocabulary |
| 3,447 | Medical Terms in Groups of Three |
| 3,432 | Causes of Death on Mount Everest |
| 3,398 | Periodic Table Quiz by Borders in 60 Seconds |
| 3,310 | The 8 Planets of Solar System - Map Quiz |
| 3,288 | Human Biology Multiple Choice Quiz #3 |
| 3,234 | Elements of the Periodic Table in Alphabetical Order |
| 3,160 | Muscles of the Human Body |
| 3,108 | Physics, Famous Physicists |
| 3,111 | Medicine and Anatomy by Letter - B |
| 3,077 | Random Sequential Elements on the Periodic Table |
| 2,815 | Constellation Map |
| 2,772 | Medicine and Anatomy by Letter - C |
| 2,737 | Parts of the Brain |
| 2,708 | Periodic Table of Elements - in Order |
| 2,698 | -Ectomy Quiz |
| 2,587 | Science by Letter - A |
| 2,579 | Medicine and Anatomy by Letter - D |
| 2,570 | Amino acids |
| 2,565 | Uses of Greek Letter in Science and Mathematics |
| 2,558 | Medicine and Anatomy by Letter - F |
| 2,545 | Category Elimination - Elements (Expert) |
| 2,550 | Name Elements Containing Each Letter A-Z |
| 2,525 | Medical Terminology A-Z |
| 2,486 | Countries with the 50 Oldest Living People |
| 2,450 | Scientific Groups of Things #2 |
| 2,443 | Organic chemistry functional groups |
| 2,419 | Astronomy General Knowledge Quiz #2 |
| 2,409 | Medical prefixes and suffixes |
| 2,337 | Anatomy of the Human Eye Map Quiz |
| 2,333 | General Knowledge Science Quiz |
| 2,264 | A to Z: Infectious Diseases |
| 2,253 | 40 of the Most Important Scientists |
| 2,254 | Planets and Moons of the Solar System |
| 2,235 | First 20 elements of the Periodic table in 30 seconds |
| 2,217 | Science A-Z |
| 2,191 | Top 20 Least Forested Countries |
