| 2,261,345 | Elements of the Periodic Table |
| 1,102,727 | Planets of the Solar System Quiz |
| 227,774 | Signs of the Zodiac Quiz |
| 216,481 | Songs with Body Parts in the Title |
| 205,922 | Three Letter Body Parts |
| 198,702 | Elements by Symbol |
| 189,786 | Periodic Table Quiz - First 20 Elements |
| 177,095 | Word Scramble - Body Parts |
| 167,394 | Science General Knowledge #1 |
| 158,382 | International Scientific Units |
| 152,503 | Most Common Elements in the Human Body |
| 148,004 | Countries with the Most Forest |
| 146,414 | Body Part Words |
| 138,514 | Largest Objects in the Solar System |
| 135,964 | Elements - Sudden Death |
| 133,027 | Element... or Pokémon? |
| 130,068 | Human Body A-Z |
| 124,924 | Medical Conditions Quiz |
| 123,672 | Body Part Cliches |
| 119,936 | Organs of the Human Body (with map) |
| 119,699 | Science General Knowledge #2 |
| 110,027 | Countries with the Highest Carbon Dioxide Emissions |
| 109,619 | Science General Knowledge #3 |
| 105,821 | Countries with Glaciers |
| 105,613 | Speed Symbol by Element |
| 103,524 | Periodic Table Elements A-Z |
| 97,555 | "Ologies" Quiz |
| 97,268 | Medical Acronyms |
| 94,813 | Chemical Elements with Short Names |
| 94,068 | Random Symbol to Element |
| 93,949 | Metals of Antiquity |
| 92,324 | Medical Specialties |
| 92,273 | Click the Planet |
| 88,552 | One-Syllable Human Body Parts |
| 88,159 | Birthstones by Month |
| 86,996 | Science Multiple Choice #1 |
| 83,330 | Astronomy Quiz |
| 82,449 | Elements with One-Letter Symbols |
| 82,352 | Tropical Rainforest Countries |
| 81,393 | Click the Chemical Element |
| 81,159 | Major Taxonomic Ranks |
| 80,823 | Periodic Table Symbols |
| 78,858 | Noble Gases |
| 78,738 | Scientific Names |
| 77,127 | Name the Virus |
| 75,695 | Most Forested European Countries |
| 72,202 | Science Vocabulary #1 |
| 70,976 | Periodic Table Elements Mentioned in the Bible |
| 70,422 | Name a Valid Element |
| 70,334 | Elements by Picture |
| 66,976 | Body Parts - Sudden Death #1 |
| 66,870 | Worst Plastic Polluting Countries |
| 65,426 | Least-Forested Countries |
| 65,189 | Dumb it Down Doc |
| 65,096 | Elements that are Gases at Room Temperature |
| 64,981 | Countries Reducing Carbon Dioxide Emissions the Most |
| 64,939 | Least Forested Countries in Asia |
| 63,653 | Top 10 Most Forested Countries in Asia |
| 63,351 | Electromagnetic Spectrum |
| 62,841 | Periodic Table Elements by Clue #1 |
| 60,188 | Top 10 Solar Power Countries |
| 59,975 | Science Vocabulary #2 |
| 59,958 | Animal Anatomy Quiz |
| 59,497 | Medical Vocabulary |
| 58,260 | Diseases and Medical Conditions A-Z |
| 57,408 | Planets By Picture Quiz |
| 57,236 | First Names of Scientists |
| 57,231 | One Letter Periodic Table Symbols - Sudden Death |
| 55,790 | Countries with Tropical Rainforest and Glaciers |
| 55,726 | Countries with the Most Forest A-Z |
| 55,208 | Answers are Elements #2 |
| 55,168 | Word Chain - Science |
| 54,294 | Things Named For People #3 - Science |
| 54,198 | Least Forested European Countries |
| 54,133 | Category Elimination - Elements |
| 53,846 | Planets - Multiple Choice |
| 53,723 | Bones - Sudden Death |
| 52,974 | Answers are Elements #1 |
| 52,565 | Elemental Words |
| 52,242 | Science Vocabulary #3 |
| 49,196 | Countries by Carbon Dioxide Emissions per Capita |
| 48,469 | Groups of Two - Science |
| 48,330 | Most Guessed Elements on JetPunk |
| 48,255 | Name the Constellations |
| 47,200 | Solar System Trivia |
| 46,970 | Animals by Skeleton Image |
| 46,685 | Top 10 Least-Forested U.S. States |
| 46,378 | Body Parts - Sudden Death #2 |
| 45,773 | Top 10 Most-Forested U.S. States |
| 45,563 | Countries with the Most Malaria Deaths |
| 44,539 | Countries with the Most HIV |
| 43,757 | Fish... or Not a Fish? |
| 43,618 | Bones of the Human Body |
| 42,860 | Famous Scientists |
| 42,361 | First 30 Elements Periodic Table |
| 42,202 | Citrus Fruits |
| 41,913 | Countries that Desalinate the Most Water |
| 41,442 | Name a Valid Answer - Science |
| 40,519 | Science True or False |
| 38,963 | Diseases: Virus... or Bacteria? |
| 38,235 | Astronomy Decoder |
| 38,048 | First Twenty Elements - Sudden Death |
| 37,956 | Countries with the Highest Percentage of Forest |
| 36,767 | Science Multiple Choice #2 |
| 36,618 | Astronomy True or False |
| 36,228 | Name the Constellations - With a Map |
| 36,195 | Northernmost Countries Without Glaciers |
| 35,690 | Largest Countries Without Glaciers |
| 35,449 | Body Parts in History and Culture |
| 35,120 | The Sun Quiz |
| 34,846 | Science Multiple Choice #3 |
| 34,738 | Countries with the Most Mangroves |
| 34,025 | Bones in the Human Body |
| 32,096 | Lightest Chemical Elements A-Z |
| 31,830 | Most Common Body Part Words |
| 29,517 | Rocks and Minerals Picture Quiz |
| 28,862 | Science Decoder |
| 28,643 | Brightest Natural Objects in the Sky |
| 28,502 | Animals - Taxonomy to Common Name |
| 26,912 | Environmental Issues |
| 26,922 | U.S. States with the Most Drug Overdose Deaths |
| 25,924 | Top 10 U.S. States by Solar Power |
| 25,577 | Body Parts - No Vowels |
| 25,529 | U.S. States with Glaciers |
| 24,979 | Elements Named for Countries |
| 21,258 | First 40 Elements |
| 20,964 | 16 Questions that Prove that Physics Makes No Sense |
| 19,780 | Click Every Chemical Symbol |
| 18,807 | Elements Whose First Letter Doesn't Match the Symbol |
| 18,740 | The Mars Quiz |
| 18,477 | Albert Einstein Trivia |
| 17,468 | Countries with the Most Sunlight Per Square Meter |
| 16,531 | The Jupiter Quiz |
| 15,553 | First 50 Elements |
| 14,775 | Recommended Childhood Vaccines for Americans |
| 14,602 | The Voyage of Darwin - Animated Map Quiz |
| 14,073 | The Diseases They Had |
| 14,068 | Name the Metal Alloy |
| 13,946 | Elements of the Periodic Table by Symbol |
| 13,243 | Periodic Table Symbols - Sudden Death |
| 12,846 | Famous Effects |
| 12,696 | Medicine and Anatomy by Letter - A |
| 12,329 | Periodic Table Elements by Clue #2 |
| 11,670 | A Quiz About Diamonds |
| 11,598 | The Saturn Quiz |
| 11,475 | Random Elements on the Periodic Table |
| 11,081 | Amino Acids to 1 Letter Code |
| 10,669 | Random Element to Atomic Number |
| 10,328 | Physics Equations |
| 9,938 | The Pluto Quiz |
| 9,535 | First 60 Elements |
| 9,162 | Simple Machines Quiz |
| 8,977 | Periodic table challenge - IN ORDER! |
| 8,551 | Astronomy & Space |
| 8,488 | Medication... or Pokémon? |
| 8,331 | Periodic Table of Elements - in Order |
| 7,859 | All Elements of The Periodic Table - Sudden Death (Hard) |
| 7,760 | The Elements of the Periodic Table |
| 7,704 | Name Elements Containing Each Letter A-Z |
| 7,414 | Click the Chemical Element #2 |
| 7,357 | Organs of the Body |
| 6,972 | Constellation Map |
| 6,966 | The Venus Quiz |
| 6,871 | Science General Knowledge #1 |
| 6,812 | Countries That Discovered the Elements of the Periodic Table |
| 6,719 | First 28 Countries of Wuhan Coronavirus COVID-19 Outbreak |
| 6,300 | Moons of the Solar System |
| 6,294 | Random Constellations on a Map |
| 6,152 | Medicine and Anatomy by Letter - B |
| 6,069 | Scientific Groups of Things #1 |
| 5,806 | Human Skeleton |
| 5,801 | Human anatomy for dummies |
| 5,763 | Name the Planets* |
| 5,715 | Medicine and Anatomy by Letter - C |
| 5,656 | Physics General Knowledge |
| 5,605 | Muscles of the human body - with a map |
| 5,590 | Elements of The Periodic Table - Sudden Death |
| 5,502 | Human Biology Multiple Choice Quiz #3 |
| 5,469 | Causes of Death on Mount Everest |
| 5,161 | Astronomy General Knowledge Quiz #1 |
| 5,063 | Medicine and Anatomy by Letter - D |
| 5,057 | Click the Element on the Periodic Table |
| 5,033 | Crossword - Elements |
| 4,793 | The 8 Planets of Solar System - Map Quiz |
| 4,625 | Medicine and Anatomy by Letter - F |
| 4,626 | Click on the Fish (Sudden Death) |
| 4,573 | Space and Astronomy General Knowledge |
| 4,505 | Random Sequential Elements on the Periodic Table |
| 4,464 | Biology Vocabulary |
| 4,467 | Physics A-Z |
| 4,302 | Periodic Table Quiz by Borders in 60 Seconds |
| 4,216 | Musical Movies - Sudden Death #2 |
| 4,196 | Muscles of the Human Body |
| 4,171 | Seven Strong Acids Quiz |
| 4,164 | Amino Acid Structures |
| 4,098 | Medicine and Anatomy by Letter - E |
| 4,040 | Name the 20 Amino Acids |
| 4,025 | Anatomy of the Human Eye Map Quiz |
| 3,983 | First 36 Periodic Table Elements |
