| Taken | Quiz |
|---|
| 1,650,434 | Elements of the Periodic Table Quiz |
| 929,021 | Planets of the Solar System Quiz |
| 189,673 | Three Letter Body Parts Quiz |
| 183,118 | Songs with Body Parts in the Title |
| 182,156 | Signs of the Zodiac Quiz |
| 154,435 | Elements by Symbol Quiz |
| 150,502 | Word Scramble - Body Parts |
| 132,430 | Periodic Table Quiz - First 20 Elements |
| 129,919 | Body Part Words Quiz |
| 125,841 | Countries with the Most Forest |
| 121,837 | Science General Knowledge #1 |
| 115,074 | Body Part Cliches |
| 114,025 | Most Common Elements in the Human Body |
| 111,854 | International Scientific Units |
| 106,547 | Medical Conditions Quiz |
| 99,218 | Human Body A-Z |
| 94,095 | Organs of the Human Body (with map) |
| 89,083 | Countries with the Highest Carbon Dioxide Emissions |
| 87,234 | Largest Objects in the Solar System |
| 85,740 | Science General Knowledge #2 |
| 83,058 | "Ologies" Quiz |
| 81,757 | Element... or Pokémon? |
| 80,699 | Medical Acronyms |
| 79,501 | Speed Symbol by Element |
| 77,709 | Medical Specialties |
| 73,522 | One-Syllable Human Body Parts |
| 72,722 | Countries with Glaciers |
| 72,542 | Science Multiple Choice #1 |
| 72,305 | Science General Knowledge #3 |
| 70,368 | Chemical Elements with Short Names |
| 65,516 | Periodic Table Elements A-Z |
| 64,260 | Tropical Rainforest Countries |
| 63,774 | Metals of Antiquity |
| 63,488 | Random Symbol to Element |
| 60,405 | Most Forested European Countries |
| 60,348 | Major Taxonomic Ranks |
| 59,644 | Science Vocabulary #1 |
| 58,995 | Scientific Names |
| 57,911 | Dumb it Down Doc |
| 57,475 | Name the Virus |
| 55,675 | Animal Anatomy Quiz |
| 55,232 | Least Forested Countries in Asia |
| 54,517 | Astronomy Quiz |
| 54,411 | Noble Gases |
| 54,048 | Top 10 Most Forested Countries in Asia |
| 53,617 | Worst Plastic Polluting Countries |
| 52,999 | Elements with One-Letter Symbols |
| 51,480 | Top 10 Solar Power Countries |
| 48,751 | Least-Forested Countries |
| 48,678 | Answers are Elements #2 |
| 48,254 | Answers are Elements #1 |
| 48,204 | Science Vocabulary #2 |
| 47,621 | First Names of Scientists |
| 47,156 | Countries by Carbon Dioxide Emissions per Capita |
| 46,871 | Medical Vocabulary |
| 46,625 | Least Forested European Countries |
| 46,302 | Elements that are Gases at Room Temperature |
| 46,158 | Click the Chemical Element |
| 45,655 | Countries with the Most Forest A-Z |
| 45,406 | Periodic Table Elements Mentioned in the Bible |
| 45,035 | Periodic Table Elements by Clue |
| 44,336 | Countries by Change in Carbon Dioxide Emissions |
| 43,115 | Groups of Two - Science |
| 43,054 | Science Vocabulary #3 |
| 43,048 | Name a Valid Element |
| 42,886 | Electromagnetic Spectrum |
| 42,695 | Elements by Picture |
| 42,107 | Elemental Words |
| 40,582 | Countries with Tropical Rainforest and Glaciers |
| 40,488 | Category Elimination - Elements |
| 40,023 | Click the Planet |
| 39,650 | Citrus Fruits |
| 39,448 | Countries with the Most HIV |
| 39,454 | Planets By Picture Quiz |
| 37,394 | Famous Scientists |
| 37,385 | Name the Constellations Quiz |
| 36,977 | Diseases and Medical Conditions A-Z |
| 36,426 | Most Guessed Elements on JetPunk |
| 36,302 | Word Chain - Science |
| 35,801 | Things Named For People #3 - Science |
| 35,451 | Metals by Total Mined Value |
| 35,430 | Periodic Table Symbols Quiz |
| 33,635 | Fish... or Not a Fish? |
| 31,849 | Science True or False |
| 31,678 | Countries with the Highest Percentage of Forest |
| 31,551 | Top 10 Least-Forested U.S. States |
| 31,338 | Top 10 Most-Forested U.S. States |
| 30,568 | Astronomy True or False |
| 30,559 | Planets - Multiple Choice |
| 30,468 | Animals by Skeleton Image |
| 30,267 | Diseases: Virus... or Bacteria? |
| 30,173 | Solar System Trivia |
| 29,903 | Science Multiple Choice #2 |
| 29,480 | Countries with the Most Malaria Deaths |
| 29,444 | Countries with the Most Mangroves |
| 28,740 | Bones in the Human Body |
| 28,562 | First 30 Elements Periodic Table |
| 27,804 | Most Common Body Part Words |
| 27,396 | Science Multiple Choice #3 |
| 26,266 | Astronomy Decoder |
| 26,208 | Name the Constellations - With a Map |
| 24,751 | Lightest Chemical Elements A-Z |
| 24,564 | Science Decoder |
| 23,987 | Rocks and Minerals Picture Quiz |
| 23,896 | Body Parts in History and Culture |
| 23,615 | Environmental Issues |
| 22,712 | Name a Valid Answer - Science |
| 22,686 | The Sun Quiz |
| 22,168 | Animals - Taxonomy to Common Name |
| 19,952 | U.S. States with the Most Drug Overdose Deaths |
| 19,874 | Countries that Desalinate the Most Water |
| 18,363 | Body Parts - No Vowels |
| 16,538 | Northernmost Countries Without Glaciers |
| 16,137 | U.S. States with Glaciers |
| 15,712 | 16 Questions that Prove that Physics Makes No Sense |
| 15,497 | The Mars Quiz |
| 14,486 | Brightest Objects in the Sky |
| 12,631 | Elements of the Periodic Table by Symbol |
| 12,540 | Largest Countries Without Glaciers |
| 12,370 | Recommended Childhood Vaccines for Americans |
| 12,020 | The Diseases They Had |
| 11,906 | Top 10 U.S. States by Solar Power |
| 11,274 | Albert Einstein Quiz |
| 10,029 | The Jupiter Quiz |
| 10,022 | The Voyage of Darwin - Animated Map Quiz |
| 9,388 | The Saturn Quiz |
| 9,374 | Click Every Chemical Symbol |
| 8,974 | Physics Equations |
| 8,409 | Periodic table challenge - IN ORDER! |
| 8,013 | Bones of the Human Body (with a map) |
| 7,898 | Random Element to Atomic Number |
| 7,553 | Simple Machines Quiz |
| 7,465 | Amino Acids to 1 Letter Code |
| 7,274 | Astronomy & Space |
| 7,224 | The Pluto Quiz |
| 7,215 | The Elements of the Periodic Table |
| 6,511 | Organs of the Body |
| 6,398 | Medicine and Anatomy by Letter - A |
| 6,355 | Random Elements on the Periodic Table |
| 6,075 | First 28 Countries of Wuhan Coronavirus COVID-19 Outbreak |
| 5,711 | The Venus Quiz |
| 5,531 | Moons of the Solar System |
| 5,333 | Science General Knowledge #1 |
| 4,999 | First 50 Elements |
| 4,946 | First 60 Elements |
| 4,664 | Physics General Knowledge |
| 4,436 | Name the Planets* |
| 4,435 | Scientific Groups of Things #1 |
| 4,305 | First 40 Elements |
| 4,231 | Click the Chemical Element #2 |
| 4,072 | Astronomy General Knowledge Quiz #1 |
| 3,977 | Random Constellations on a Map |
| 3,777 | Space and Astronomy General Knowledge |
| 3,703 | Human Skeleton |
| 3,532 | Seven Strong Acids Quiz |
| 3,509 | Biology Vocabulary |
| 4,110 | Countries That Discovered the Elements of the Periodic Table |
| 3,429 | Medical Terms in Groups of Three |
| 3,414 | Causes of Death on Mount Everest |
| 3,363 | Periodic Table Quiz by Borders in 60 Seconds |
| 3,297 | The 8 Planets of Solar System - Map Quiz |
| 3,228 | Elements of the Periodic Table in Alphabetical Order |
| 3,220 | Human Biology Multiple Choice Quiz #3 |
| 3,086 | Physics, Famous Physicists |
| 3,078 | Muscles of the Human Body |
| 3,062 | Random Sequential Elements on the Periodic Table |
| 3,054 | Medicine and Anatomy by Letter - B |
| 2,777 | Constellation Map |
| 2,724 | Parts of the Brain |
| 2,719 | Medicine and Anatomy by Letter - C |
| 2,695 | -Ectomy Quiz |
| 2,615 | Periodic Table of Elements - in Order |
| 2,572 | Science by Letter - A |
| 2,556 | Amino acids |
| 2,549 | Uses of Greek Letter in Science and Mathematics |
| 2,533 | Category Elimination - Elements (Expert) |
| 2,526 | Medicine and Anatomy by Letter - D |
| 2,513 | Medicine and Anatomy by Letter - F |
| 2,493 | Medical Terminology A-Z |
| 2,489 | Name Elements Containing Each Letter A-Z |
| 2,479 | Countries with the 50 Oldest Living People |
| 2,441 | Scientific Groups of Things #2 |
| 2,426 | Organic chemistry functional groups |
| 2,406 | Astronomy General Knowledge Quiz #2 |
| 2,396 | Medical prefixes and suffixes |
| 2,317 | General Knowledge Science Quiz |
| 2,302 | Anatomy of the Human Eye Map Quiz |
| 2,243 | 40 of the Most Important Scientists |
| 2,241 | A to Z: Infectious Diseases |
| 2,240 | Planets and Moons of the Solar System |
| 2,217 | First 20 elements of the Periodic table in 30 seconds |
| 2,200 | Science A-Z |
| 2,182 | Top 20 Least Forested Countries |
