| International Scientific Units | 0 | - | 4.95 | 156,546 |
| Electromagnetic Spectrum | 0 | - | 4.93 | 62,678 |
| English Words Formed by Latin and Greek Roots | 0 | - | 4.46 | 67,067 |
| Elements of the Periodic Table | 0 | - | 5.00 | 2,237,765 |
| Elements by Symbol | 0 | - | 4.92 | 196,852 |
| Speed Symbol by Element | 0 | - | 4.91 | 104,493 |
| Chemical Elements with Short Names | 0 | - | 4.81 | 94,109 |
| Noble Gases | 0 | - | 4.89 | 78,035 |
| Elements that are Gases at Room Temperature | 0 | - | 4.86 | 64,476 |
| Periodic Table Symbols | 0 | - | 4.97 | 71,951 |
| Elements with One-Letter Symbols | 0 | - | 4.83 | 81,507 |
| Name the Virus | 0 | - | 4.87 | 76,665 |
| Spanish-Speaking Countries | 0 | - | 4.95 | 374,609 |
| Top World Languages | 0 | - | 4.92 | 820,208 |
| Major Taxonomic Ranks | 0 | - | 4.63 | 80,420 |
| Famous Scientists | 0 | - | 4.57 | 42,605 |
| Things Named For People #3 - Science | 0 | - | 4.85 | 53,891 |
| Elemental Words | 0 | - | 4.96 | 52,226 |
| Metals of Antiquity | 0 | - | 4.95 | 93,326 |
| Countries by Official Language | 0 | - | 4.95 | 194,641 |
| Places in their Native Language #1 | 0 | - | 4.85 | 241,567 |
| Places in their Native Language #2 | 0 | - | 4.79 | 133,876 |
| Countries with the Most Speakers of These Languages | 0 | - | 4.91 | 295,529 |
| Countries in their Native Language | 0 | - | 4.99 | 198,184 |
| Count to 10 in Europe: Pro | 0 | - | 4.86 | 69,007 |
| Official European Union Languages | 0 | - | 4.97 | 238,159 |
| European Countries in their Native Language | 0 | - | 4.99 | 157,632 |
| Countries With the Most English Speakers | 0 | - | 4.86 | 131,542 |
| Top World Languages on a Map | 0 | - | 4.93 | 102,998 |
| Official Languages of the World on the Disappearing World Map | 0 | - | 4.99 | 116,317 |
| Wikipedia Languages | 0 | - | 4.97 | 126,946 |
| All Romance Languages on a Map | 0 | - | 4.98 | 72,779 |
| Countries of the World in All Featured Languages | 0 | - | 4.99 | 35,225 |
| Identify the Language on the World Map #1 | 0 | - | 5.00 | 59,590 |
| Random Symbol to Element | 0 | - | 4.88 | 92,874 |
| Astronomy Quiz | 0 | - | 4.90 | 82,411 |
| Largest Objects in the Solar System | 0 | - | 4.99 | 136,940 |
| Solar System Trivia | 0 | - | 4.93 | 46,511 |
| Spanish to English Country Names | 0 | - | 4.86 | 32,877 |
| Top World Languages A-Z | 0 | - | 4.83 | 36,576 |
| Top Five Languages by Language Family | 0 | - | 4.99 | 53,866 |
| Every Country in its Official/Native Language | 0 | - | 4.98 | 25,285 |
| All Wikipedia Languages | 0 | - | 4.95 | 28,195 |
| Identify the Language on the World Map #2 | 0 | - | 4.94 | 25,768 |
| German-Speaking Countries | 0 | - | 4.91 | 145,332 |
| Italian Name Translation | 0 | - | 4.82 | 46,374 |
| French-Speaking Countries | 0 | - | 4.85 | 270,214 |
| French Vocabulary Mega-Challenge | 0 | - | 4.87 | 120,834 |
| Click Timeline: Countries Independence | 0 | - | 4.92 | 61,991 |
| Click Timeline: Fictional Characters #1 | 0 | - | 4.98 | 82,798 |
| Country to Population Click Quiz | 0 | - | 4.98 | 43,718 |
| Scientific Names | 0 | - | 4.32 | 78,385 |
| Science Multiple Choice #1 | 0 | - | 4.53 | 86,452 |
| Lightest Chemical Elements A-Z | 0 | - | 4.57 | 31,979 |
| Periodic Table Quiz - First 20 Elements | 0 | - | 4.73 | 188,469 |
| Periodic Table Elements by Clue #1 | 0 | - | 4.80 | 62,444 |
| Body Part Cliches | 0 | - | 4.43 | 123,255 |
| Bones of the Human Body | 0 | - | 4.52 | 42,122 |
| Medical Conditions Quiz | 0 | - | 4.78 | 124,071 |
| Planets of the Solar System Quiz | 0 | - | 4.93 | 1,095,936 |
| English Speaking Countries | 0 | - | 4.64 | 357,094 |
| Third Most Common Language by U.S. State | 0 | - | 4.87 | 113,660 |
| Most Spoken Languages in Canada | 0 | - | 4.91 | 55,048 |
| Category Elimination - Official Languages | 0 | - | 4.98 | 69,657 |
| Top 10 Countries with the Most Spanish Speakers | 0 | - | 4.95 | 124,572 |
| U.S. Cities With Spanish Names | 0 | - | 4.94 | 22,971 |
| Countries where Arabic is an Official Language | 0 | - | 4.85 | 72,442 |
| Click Timeline: Famous Buildings | 0 | - | 4.96 | 61,968 |
| Name a Valid Answer - Science | 0 | - | 4.79 | 40,794 |
| Body Parts in History and Culture | 0 | - | 4.43 | 35,251 |
| Science General Knowledge #1 | 0 | - | 4.54 | 165,646 |
| Science General Knowledge #2 | 0 | - | 4.48 | 118,546 |
| Science General Knowledge #3 | 0 | - | 4.56 | 107,869 |
| Science Vocabulary #2 | 0 | - | 4.52 | 59,560 |
| Simple Machines Quiz | 0 | - | 4.35 | 9,106 |
| Word Chain - Science | 0 | - | 4.59 | 54,813 |
| Diseases: Virus... or Bacteria? | 0 | - | 4.61 | 38,651 |
| Science Multiple Choice #2 | 0 | - | 4.37 | 36,519 |
| Science Multiple Choice #3 | 0 | - | 4.39 | 34,565 |
| Most Common Elements in the Human Body | 0 | - | 4.74 | 151,479 |
| Name the Constellations - With a Map | 0 | - | 4.92 | 35,873 |
| The Sun Quiz | 0 | - | 4.93 | 34,536 |
| Environmental Issues | 0 | - | 4.54 | 26,812 |
| 15 Most Populous Countries that Speak a Romance Language | 0 | - | 4.75 | 127,652 |
| First Names of Scientists | 0 | - | 4.50 | 56,745 |
| Groups of Two - Science | 0 | - | 4.26 | 48,282 |
| Science Vocabulary #1 | 0 | - | 4.34 | 71,735 |
| Science Vocabulary #3 | 0 | - | 4.31 | 51,906 |
| Science Decoder | 0 | - | 4.52 | 28,739 |
| Rocks and Minerals Picture Quiz | 0 | - | 4.48 | 29,285 |
| Animals - Taxonomy to Common Name | 0 | - | 4.80 | 28,243 |
| Science True or False | 0 | - | 4.35 | 40,248 |
| Answers are Elements #2 | 0 | - | 4.43 | 54,979 |
| Elements by Picture | 0 | - | 4.27 | 69,846 |
| Periodic Table Elements A-Z | 0 | - | 4.77 | 102,750 |
| Name a Valid Element | 0 | - | 4.64 | 69,945 |
| Medical Acronyms | 0 | - | 4.43 | 96,739 |
| Medical Vocabulary | 0 | - | 4.54 | 59,028 |
| Slavic Languages | 0 | - | 4.68 | 54,282 |
| Top 12 Languages Spoken in Asia | 0 | - | 4.39 | 32,531 |
| Translations of John | 0 | - | 4.53 | 27,060 |
| Spanish Animal Words | 0 | - | 4.53 | 95,650 |
| U.S. Cities with the Most Spanish Speakers | 0 | - | 4.50 | 40,227 |
| Countries With the Most Italian Speakers | 0 | - | 4.49 | 57,810 |
| French Animal Words | 0 | - | 4.44 | 134,299 |
| French Food Words | 0 | - | 4.80 | 194,608 |
| TV Title Translation - French | 0 | - | 4.22 | 33,964 |
| Word Addition Click Quiz #1 | 0 | - | 4.73 | 49,524 |
| Birthstones by Month | 0 | - | 4.41 | 80,614 |
| "Ologies" Quiz | 0 | - | 4.34 | 96,622 |
| Albert Einstein Trivia | 0 | - | 4.58 | 18,365 |
| Name the Metal Alloy | 0 | - | 4.70 | 13,641 |
| Answers are Elements #1 | 0 | - | 4.29 | 52,800 |
| Most Guessed Elements on JetPunk | 0 | - | 4.56 | 48,181 |
| Element... or Pokémon? | 0 | - | 4.98 | 131,408 |
| Brightest Natural Objects in the Sky | 0 | - | 4.45 | 28,195 |
| Planets By Picture Quiz | 0 | - | 4.49 | 56,670 |
| Planets - Multiple Choice | 0 | - | 4.39 | 53,487 |
| Body Part Words | 0 | - | 4.43 | 145,873 |
| Animal Anatomy Quiz | 0 | - | 4.39 | 59,787 |
| Word Scramble - Body Parts | 0 | - | 4.38 | 176,219 |
| Three Letter Body Parts | 0 | - | 4.40 | 205,513 |
| Human Body A-Z | 0 | - | 4.51 | 129,056 |
| One-Syllable Human Body Parts | 0 | - | 4.29 | 88,071 |
| Organs of the Human Body (with map) | 0 | - | 4.10 | 119,110 |
| Medical Specialties | 0 | - | 4.32 | 91,687 |
| Diseases and Medical Conditions A-Z | 0 | - | 4.69 | 57,598 |
| Most-Spoken Languages of the United States | 0 | - | 4.52 | 219,240 |
| Spanish Name Translation | 0 | - | 4.13 | 168,434 |
| Spanish Food Words | 0 | - | 4.67 | 250,910 |
| Italian Food Words | 0 | - | 4.29 | 71,190 |
| The Pluto Quiz | 0 | - | 4.61 | 9,825 |
| Citrus Fruits | 0 | - | 3.63 | 42,053 |
| Fish... or Not a Fish? | 0 | - | 4.39 | 43,423 |
| Periodic Table Elements Mentioned in the Bible | 0 | - | 4.77 | 70,623 |
| Category Elimination - Elements | 0 | - | 4.61 | 53,591 |
| Astronomy Decoder | 0 | - | 4.50 | 38,007 |
| The Jupiter Quiz | 0 | - | 4.64 | 16,443 |
| The Mars Quiz | 0 | - | 4.55 | 18,637 |
| The Saturn Quiz | 0 | - | 4.54 | 11,543 |
| Most Common Body Part Words | 0 | - | 3.90 | 31,627 |
| The Diseases They Had | 0 | - | 4.15 | 13,985 |
| Dumb it Down Doc | 0 | - | 4.13 | 64,934 |
| 16 Questions that Prove that Physics Makes No Sense | 0 | - | 4.18 | 20,757 |
| Official Languages of South Africa | 0 | - | 4.56 | 26,139 |
| Spanish Loan Words | 0 | - | 4.23 | 45,853 |
| TV Title Translation - Spanish | 0 | - | 4.14 | 12,070 |
| English Words of Italian Origin | 0 | - | 4.15 | 67,400 |
| French Phrases used in English | 0 | - | 4.16 | 46,657 |
| English Words of Russian Origin | 0 | - | 4.14 | 50,917 |
| The Venus Quiz | 0 | - | 4.21 | 6,912 |
| Signs of the Zodiac Quiz | 0 | - | 4.45 | 225,303 |
| Name the Constellations | 0 | - | 4.58 | 44,917 |
| Astronomy True or False | 0 | - | 4.39 | 36,419 |
| Songs with Body Parts in the Title | 0 | - | 4.31 | 215,558 |
| Body Parts - No Vowels | 0 | - | 4.13 | 25,282 |
| Hebrew Letters Quiz | 0 | - | 4.38 | 13,770 |
| Language Origins of Popular First Names | 0 | - | 3.85 | 20,836 |
| Rhyme Time - Spanish | 0 | - | 4.17 | 14,090 |
| Elements Named for Countries | 0 | - | 4.52 | 24,638 |
| Recommended Childhood Vaccines for Americans | 0 | - | 4.42 | 14,694 |
| Animals by Skeleton Image | 0 | - | 4.80 | 46,362 |
| The Voyage of Darwin - Animated Map Quiz | 0 | - | 4.99 | 14,450 |
| Countries with the Most HIV | 0 | - | 4.46 | 44,418 |
| Countries with the Most Malaria Deaths | 0 | - | 4.45 | 45,210 |
| U.S. States with the Most Drug Overdose Deaths | 0 | - | 4.09 | 26,132 |
| Countries with the Highest Carbon Dioxide Emissions | 0 | - | 4.97 | 109,681 |
| Countries by Carbon Dioxide Emissions per Capita | 0 | - | 4.03 | 49,144 |
| Countries Reducing Carbon Dioxide Emissions the Most | 0 | - | 4.89 | 64,561 |
| Countries with the Most Mangroves | 0 | - | 4.53 | 34,586 |
| Top 10 Solar Power Countries | 0 | - | 4.78 | 59,951 |
| Top 10 U.S. States by Solar Power | 0 | - | 4.24 | 25,789 |
| Worst Plastic Polluting Countries | 0 | - | 4.51 | 66,408 |
| Countries that Desalinate the Most Water | 0 | - | 4.77 | 41,588 |
| Countries with the Most Forest | 0 | - | 4.87 | 147,421 |
| Top 10 Most-Forested U.S. States | 0 | - | 4.37 | 45,597 |
| Least-Forested Countries | 0 | - | 4.53 | 65,143 |
| Top 10 Most Forested Countries in Asia | 0 | - | 4.63 | 63,381 |
| Countries with the Most Forest A-Z | 0 | - | 4.63 | 55,424 |
| Most Forested European Countries | 0 | - | 4.80 | 75,249 |
| Least Forested European Countries | 0 | - | 4.25 | 53,971 |
| Least Forested Countries in Asia | 0 | - | 4.74 | 64,650 |
| Countries with the Highest Percentage of Forest | 0 | - | 4.61 | 37,782 |
| Top 10 Least-Forested U.S. States | 0 | - | 4.50 | 46,479 |
| Tropical Rainforest Countries | 0 | - | 4.69 | 81,990 |
| Countries with Tropical Rainforest and Glaciers | 0 | - | 4.51 | 55,598 |
| Countries with Glaciers | 0 | - | 4.97 | 105,177 |
| Northernmost Countries Without Glaciers | 0 | - | 4.62 | 36,134 |
| Countries by Languages in 90 Seconds | 0 | - | 4.94 | 719,074 |
| Biggest English-Speaking Cities | 0 | - | 4.44 | 152,201 |
| Biggest Spanish-Speaking Cities | 0 | - | 4.91 | 128,044 |
| Biggest Cities by Language | 0 | - | 4.96 | 246,016 |
| Random Translations Quiz #1 | 0 | - | 3.65 | 37,732 |
| Official Languages of the World | 0 | - | 4.99 | 416,594 |
| Capitals in their Native Languages | 0 | - | 4.95 | 133,331 |
| Random Name Translation | 0 | - | 4.52 | 42,371 |
| Random Translations Quiz #2 | 0 | - | 4.17 | 37,530 |
| Random Translations Quiz #3 | 0 | - | 4.00 | 32,871 |
| Random Translations Quiz #4 | 0 | - | 4.29 | 37,049 |
| Language Names in the Language | 0 | - | 4.91 | 159,638 |
