| Taken | Quiz |
|---|
| 1,651,722 | Elements of the Periodic Table Quiz |
| 929,362 | Planets of the Solar System Quiz |
| 189,728 | Three Letter Body Parts Quiz |
| 183,188 | Songs with Body Parts in the Title |
| 182,366 | Signs of the Zodiac Quiz |
| 154,510 | Elements by Symbol Quiz |
| 150,537 | Word Scramble - Body Parts |
| 132,518 | Periodic Table Quiz - First 20 Elements |
| 129,980 | Body Part Words Quiz |
| 125,884 | Countries with the Most Forest |
| 121,931 | Science General Knowledge #1 |
| 115,094 | Body Part Cliches |
| 114,080 | Most Common Elements in the Human Body |
| 111,982 | International Scientific Units |
| 106,597 | Medical Conditions Quiz |
| 99,256 | Human Body A-Z |
| 94,134 | Organs of the Human Body (with map) |
| 89,120 | Countries with the Highest Carbon Dioxide Emissions |
| 87,371 | Largest Objects in the Solar System |
| 85,796 | Science General Knowledge #2 |
| 83,081 | "Ologies" Quiz |
| 81,897 | Element... or Pokémon? |
| 80,729 | Medical Acronyms |
| 79,537 | Speed Symbol by Element |
| 77,747 | Medical Specialties |
| 73,555 | One-Syllable Human Body Parts |
| 72,758 | Countries with Glaciers |
| 72,585 | Science Multiple Choice #1 |
| 72,350 | Science General Knowledge #3 |
| 70,400 | Chemical Elements with Short Names |
| 65,557 | Periodic Table Elements A-Z |
| 64,283 | Tropical Rainforest Countries |
| 63,803 | Metals of Antiquity |
| 63,522 | Random Symbol to Element |
| 60,438 | Most Forested European Countries |
| 60,427 | Major Taxonomic Ranks |
| 59,671 | Science Vocabulary #1 |
| 59,014 | Scientific Names |
| 57,934 | Dumb it Down Doc |
| 57,494 | Name the Virus |
| 55,688 | Animal Anatomy Quiz |
| 55,260 | Least Forested Countries in Asia |
| 54,579 | Astronomy Quiz |
| 54,437 | Noble Gases |
| 54,076 | Top 10 Most Forested Countries in Asia |
| 53,668 | Worst Plastic Polluting Countries |
| 53,039 | Elements with One-Letter Symbols |
| 51,516 | Top 10 Solar Power Countries |
| 48,769 | Least-Forested Countries |
| 48,695 | Answers are Elements #2 |
| 48,263 | Answers are Elements #1 |
| 48,235 | Science Vocabulary #2 |
| 47,651 | First Names of Scientists |
| 47,166 | Countries by Carbon Dioxide Emissions per Capita |
| 46,898 | Medical Vocabulary |
| 46,634 | Least Forested European Countries |
| 46,324 | Elements that are Gases at Room Temperature |
| 46,238 | Click the Chemical Element |
| 45,690 | Countries with the Most Forest A-Z |
| 45,436 | Periodic Table Elements Mentioned in the Bible |
| 45,062 | Periodic Table Elements by Clue |
| 44,360 | Countries by Change in Carbon Dioxide Emissions |
| 43,137 | Groups of Two - Science |
| 43,079 | Science Vocabulary #3 |
| 43,087 | Name a Valid Element |
| 42,921 | Electromagnetic Spectrum |
| 42,714 | Elements by Picture |
| 42,131 | Elemental Words |
| 40,595 | Countries with Tropical Rainforest and Glaciers |
| 40,517 | Category Elimination - Elements |
| 40,093 | Click the Planet |
| 39,656 | Citrus Fruits |
| 39,497 | Planets By Picture Quiz |
| 39,477 | Countries with the Most HIV |
| 37,421 | Famous Scientists |
| 37,423 | Name the Constellations Quiz |
| 37,014 | Diseases and Medical Conditions A-Z |
| 36,445 | Most Guessed Elements on JetPunk |
| 36,331 | Word Chain - Science |
| 35,827 | Things Named For People #3 - Science |
| 35,572 | Periodic Table Symbols Quiz |
| 35,484 | Metals by Total Mined Value |
| 33,662 | Fish... or Not a Fish? |
| 31,870 | Science True or False |
| 31,707 | Countries with the Highest Percentage of Forest |
| 31,570 | Top 10 Least-Forested U.S. States |
| 31,353 | Top 10 Most-Forested U.S. States |
| 30,594 | Planets - Multiple Choice |
| 30,587 | Astronomy True or False |
| 30,515 | Animals by Skeleton Image |
| 30,281 | Diseases: Virus... or Bacteria? |
| 30,223 | Solar System Trivia |
| 29,918 | Science Multiple Choice #2 |
| 29,488 | Countries with the Most Malaria Deaths |
| 29,460 | Countries with the Most Mangroves |
| 28,752 | Bones in the Human Body |
| 28,572 | First 30 Elements Periodic Table |
| 27,812 | Most Common Body Part Words |
| 27,416 | Science Multiple Choice #3 |
| 26,278 | Astronomy Decoder |
| 26,227 | Name the Constellations - With a Map |
| 24,766 | Lightest Chemical Elements A-Z |
| 24,584 | Science Decoder |
| 24,009 | Rocks and Minerals Picture Quiz |
| 23,906 | Body Parts in History and Culture |
| 23,627 | Environmental Issues |
| 22,755 | Name a Valid Answer - Science |
| 22,718 | The Sun Quiz |
| 22,205 | Animals - Taxonomy to Common Name |
| 19,956 | U.S. States with the Most Drug Overdose Deaths |
| 19,897 | Countries that Desalinate the Most Water |
| 18,370 | Body Parts - No Vowels |
| 16,558 | Northernmost Countries Without Glaciers |
| 16,164 | U.S. States with Glaciers |
| 15,725 | 16 Questions that Prove that Physics Makes No Sense |
| 15,506 | The Mars Quiz |
| 14,501 | Brightest Objects in the Sky |
| 12,635 | Elements of the Periodic Table by Symbol |
| 12,568 | Largest Countries Without Glaciers |
| 12,378 | Recommended Childhood Vaccines for Americans |
| 12,028 | The Diseases They Had |
| 11,910 | Top 10 U.S. States by Solar Power |
| 11,289 | Albert Einstein Quiz |
| 10,044 | The Voyage of Darwin - Animated Map Quiz |
| 10,042 | The Jupiter Quiz |
| 9,413 | Click Every Chemical Symbol |
| 9,397 | The Saturn Quiz |
| 8,977 | Physics Equations |
| 8,409 | Periodic table challenge - IN ORDER! |
| 8,040 | Bones of the Human Body (with a map) |
| 7,906 | Random Element to Atomic Number |
| 7,557 | Simple Machines Quiz |
| 7,479 | Amino Acids to 1 Letter Code |
| 7,276 | Astronomy & Space |
| 7,231 | The Pluto Quiz |
| 7,217 | The Elements of the Periodic Table |
| 6,516 | Organs of the Body |
| 6,412 | Medicine and Anatomy by Letter - A |
| 6,367 | Random Elements on the Periodic Table |
| 6,077 | First 28 Countries of Wuhan Coronavirus COVID-19 Outbreak |
| 5,713 | The Venus Quiz |
| 5,539 | Moons of the Solar System |
| 5,335 | Science General Knowledge #1 |
| 5,006 | First 50 Elements |
| 4,948 | First 60 Elements |
| 4,672 | Physics General Knowledge |
| 4,437 | Scientific Groups of Things #1 |
| 4,437 | Name the Planets* |
| 4,306 | First 40 Elements |
| 4,289 | Countries That Discovered the Elements of the Periodic Table |
| 4,234 | Click the Chemical Element #2 |
| 4,073 | Astronomy General Knowledge Quiz #1 |
| 3,980 | Random Constellations on a Map |
| 3,778 | Space and Astronomy General Knowledge |
| 3,706 | Human Skeleton |
| 3,536 | Seven Strong Acids Quiz |
| 3,512 | Biology Vocabulary |
| 3,430 | Medical Terms in Groups of Three |
| 3,419 | Causes of Death on Mount Everest |
| 3,372 | Periodic Table Quiz by Borders in 60 Seconds |
| 3,300 | The 8 Planets of Solar System - Map Quiz |
| 3,229 | Elements of the Periodic Table in Alphabetical Order |
| 3,226 | Human Biology Multiple Choice Quiz #3 |
| 3,090 | Physics, Famous Physicists |
| 3,085 | Muscles of the Human Body |
| 3,066 | Random Sequential Elements on the Periodic Table |
| 3,064 | Medicine and Anatomy by Letter - B |
| 2,783 | Constellation Map |
| 2,726 | Medicine and Anatomy by Letter - C |
| 2,724 | Parts of the Brain |
| 2,695 | -Ectomy Quiz |
| 2,631 | Periodic Table of Elements - in Order |
| 2,573 | Science by Letter - A |
| 2,556 | Amino acids |
| 2,550 | Uses of Greek Letter in Science and Mathematics |
| 2,535 | Category Elimination - Elements (Expert) |
| 2,534 | Medicine and Anatomy by Letter - D |
| 2,522 | Medicine and Anatomy by Letter - F |
| 2,499 | Name Elements Containing Each Letter A-Z |
| 2,496 | Medical Terminology A-Z |
| 2,479 | Countries with the 50 Oldest Living People |
| 2,441 | Scientific Groups of Things #2 |
| 2,427 | Organic chemistry functional groups |
| 2,407 | Astronomy General Knowledge Quiz #2 |
| 2,396 | Medical prefixes and suffixes |
| 2,319 | General Knowledge Science Quiz |
| 2,305 | Anatomy of the Human Eye Map Quiz |
| 2,243 | 40 of the Most Important Scientists |
| 2,243 | Planets and Moons of the Solar System |
| 2,241 | A to Z: Infectious Diseases |
| 2,217 | First 20 elements of the Periodic table in 30 seconds |
| 2,200 | Science A-Z |
| 2,183 | Top 20 Least Forested Countries |
