| Random Symbol to Element | 0 | - | 4.87 | 83,999 |
| Europe Geography Decoder | 0 | - | 4.88 | 64,161 |
| International Scientific Units | 0 | - | 4.96 | 140,049 |
| Electromagnetic Spectrum | 0 | - | 4.93 | 57,328 |
| Planets of the Solar System Quiz | 0 | - | 4.93 | 1,016,540 |
| Science General Knowledge #1 | 0 | - | 4.63 | 140,511 |
| Science General Knowledge #2 | 0 | - | 4.45 | 98,268 |
| Science General Knowledge #3 | 0 | - | 4.54 | 89,365 |
| Word Chain - Science | 0 | - | 4.65 | 50,801 |
| Geography Decoder | 0 | - | 4.55 | 72,066 |
| Continental Geography Decoder | 0 | - | 4.45 | 49,422 |
| Elements of the Periodic Table Quiz | 0 | - | 5.00 | 1,961,513 |
| First Names of Scientists | 0 | - | 4.47 | 52,769 |
| Groups of Two - Science | 0 | - | 4.31 | 46,335 |
| Elements by Symbol Quiz | 0 | - | 4.91 | 176,807 |
| Speed Symbol by Element | 0 | - | 4.90 | 92,001 |
| Answers are Elements #2 | 0 | - | 4.42 | 52,567 |
| Noble Gases | 0 | - | 4.87 | 69,758 |
| Elements that are Gases at Room Temperature | 0 | - | 4.85 | 58,454 |
| Periodic Table Symbols Quiz | 0 | - | 4.97 | 53,625 |
| Periodic Table Elements A-Z | 0 | - | 4.78 | 86,533 |
| Name a Valid Element | 0 | - | 4.71 | 64,784 |
| Medical Conditions Quiz | 0 | - | 4.81 | 116,991 |
| Name the Virus | 0 | - | 4.86 | 72,399 |
| Major Taxonomic Ranks | 0 | - | 4.65 | 71,997 |
| Famous Scientists | 0 | - | 4.59 | 40,151 |
| Cold War Decoder | 0 | - | 4.78 | 47,445 |
| Citrus Fruits | 0 | - | 3.58 | 40,760 |
| Things Named For People #3 - Science | 0 | - | 4.82 | 48,801 |
| Answers are Elements #1 | 0 | - | 4.31 | 51,049 |
| Elemental Words | 0 | - | 4.96 | 47,936 |
| Metals of Antiquity | 0 | - | 4.93 | 86,288 |
| Word Scramble - Body Parts | 0 | - | 4.35 | 169,410 |
| Three Letter Body Parts Quiz | 0 | - | 4.39 | 199,813 |
| One-Syllable Human Body Parts | 0 | - | 4.29 | 80,876 |
| Analogies of Countries #1 | 0 | - | 4.88 | 63,415 |
| Five Letter Geography #4 | 0 | - | 4.83 | 67,721 |
| Halloween Decoder | 0 | - | 4.20 | 43,666 |
| Christmas Decoder | 0 | - | 4.38 | 46,269 |
| Name a Valid Answer - Geography | 0 | - | 4.92 | 78,797 |
| Category Elimination - Elements | 0 | - | 4.66 | 48,517 |
| Astronomy Decoder | 0 | - | 4.52 | 35,521 |
| Scientific Names | 0 | - | 4.36 | 62,518 |
| Science Multiple Choice #1 | 0 | - | 4.54 | 80,743 |
| Chemical Elements with Short Names | 0 | - | 4.66 | 76,206 |
| Periodic Table Quiz - First 20 Elements | 0 | - | 4.70 | 163,713 |
| Periodic Table Elements by Clue #1 | 0 | - | 4.76 | 58,237 |
| Elements with One-Letter Symbols | 0 | - | 4.80 | 72,156 |
| Astronomy Quiz | 0 | - | 4.87 | 70,817 |
| Solar System Trivia | 0 | - | 4.95 | 39,335 |
| Body Part Cliches | 0 | - | 4.42 | 119,487 |
| Combined Song Titles #1 | 0 | - | 4.82 | 80,465 |
| Songs that Start with the Same Word | 0 | - | 4.86 | 99,487 |
| Word Scramble - Countries | 0 | - | 4.87 | 1,947,296 |
| Solve the Secret Country #1 | 0 | - | 4.95 | 134,773 |
| Solve the Secret Country #2 | 0 | - | 4.90 | 92,149 |
| Anagram Chain - Countries | 0 | - | 4.99 | 99,441 |
| 7 Deadly Sins Quiz | 0 | - | 4.86 | 348,951 |
| Disney Animated Characters | 0 | - | 4.89 | 577,984 |
| Conspiracy Theories – Mostly U.S. | 0 | - | 4.42 | 41,269 |
| Geography General Knowledge #12 | 0 | - | 4.81 | 99,778 |
| Geographic Groups of Two #1 | 0 | - | 4.98 | 222,490 |
| Top Five Countries By Category #1 | 0 | - | 4.99 | 389,007 |
| Countries with Four Letters | 0 | - | 4.99 | 378,541 |
| 4-Letter Geography Chain #1 | 0 | - | 4.84 | 155,511 |
| Animal Decoder | 0 | - | 4.02 | 14,588 |
| Eight Most Popular Berries | 0 | - | 4.42 | 89,930 |
| Top 20 Fruits Sold in the U.S. | 0 | - | 4.45 | 59,779 |
| Countries but all Vowels are Changed to O | 0 | - | 4.85 | 37,909 |
| Solve the Secret Country #3 | 0 | - | 4.97 | 47,231 |
| Simple Machines Quiz | 0 | - | 4.32 | 8,457 |
| Songs with Body Parts in the Title | 0 | - | 4.30 | 204,080 |
| Countries of the World with an Empty Map - Hard Version | 0 | - | 5.00 | 279,834 |
| Islands by Country #1 | 0 | - | 4.87 | 164,860 |
| Regions of Countries #1 | 0 | - | 4.96 | 150,754 |
| Regions of Countries #2 | 0 | - | 4.95 | 115,559 |
| Regions of Countries #3 | 0 | - | 4.84 | 84,423 |
| Random Geographic Groups of Five | 0 | - | 4.93 | 101,634 |
| Top Five Countries By Category #2 | 0 | - | 4.92 | 159,424 |
| Top Five Countries By Category #3 | 0 | - | 4.86 | 144,775 |
| Country Chain | 0 | - | 4.96 | 199,699 |
| Can You Name These 50 Random Countries? | 0 | - | 4.98 | 185,151 |
| Name a Valid Year in History | 0 | - | 4.92 | 54,876 |
| Name a Valid First-Level Subdivision for Every Country | 0 | - | 4.97 | 44,589 |
| Name a Valid Country #3 | 0 | - | 4.98 | 213,419 |
| Name a Valid Country #1 | 0 | - | 4.99 | 232,608 |
| Name a Valid Country #2 | 0 | - | 4.98 | 198,841 |
| Name a Valid Country #4 | 0 | - | 4.97 | 206,082 |
| Name a Valid Country #5 | 0 | - | 4.99 | 164,195 |
| Name a Valid Country #6 | 0 | - | 4.94 | 103,228 |
| Name a Valid Country #7 | 0 | - | 4.90 | 90,311 |
| Name a Valid Country #8 | 0 | - | 4.94 | 60,226 |
| Name a Valid Country by Disputed Area | 0 | - | 4.81 | 35,988 |
| Add A Letter - Make a European City | 0 | - | 4.88 | 21,180 |
| Science Vocabulary #2 | 0 | - | 4.50 | 55,017 |
| Diseases: Virus... or Bacteria? | 0 | - | 4.60 | 35,220 |
| Science Multiple Choice #2 | 0 | - | 4.38 | 33,604 |
| Most Common Elements in the Human Body | 0 | - | 4.72 | 140,901 |
| Lightest Chemical Elements A-Z | 0 | - | 4.56 | 30,988 |
| Environmental Issues | 0 | - | 4.53 | 25,540 |
| Body Parts in History and Culture | 0 | - | 4.48 | 33,119 |
| One Letter Answers #1 | 0 | - | 4.47 | 73,398 |
| First Names of Historical Figures #1 | 0 | - | 4.41 | 218,064 |
| Guess a Top 5 Last Name by Country | 0 | - | 4.76 | 39,684 |
| Shared First Names #2 | 0 | - | 4.57 | 41,190 |
| People with J Initials | 0 | - | 4.52 | 44,275 |
| History Analogies #1 | 0 | - | 4.47 | 76,538 |
| History Analogies #2 | 0 | - | 4.51 | 64,963 |
| History Analogies #3 | 0 | - | 4.54 | 67,113 |
| English Idioms Quiz #1 | 0 | - | 4.44 | 135,494 |
| Cliche Quotes Quiz #2 | 0 | - | 4.41 | 43,289 |
| Best-Selling Video Game Consoles | 0 | - | 4.79 | 221,837 |
| Are You a Nerd? | 0 | - | 4.32 | 39,893 |
| The Eleven Colors | 0 | - | 4.72 | 220,680 |
| Answers Contain King | 0 | - | 4.44 | 40,542 |
| Things that are "Super" | 0 | - | 4.50 | 98,100 |
| Four Letter Geography #1 | 0 | - | 4.72 | 83,819 |
| Four Letter Geography #2 | 0 | - | 4.41 | 59,451 |
| Five Letter Geography #3 | 0 | - | 4.65 | 122,159 |
| Six Letter Geography #2 | 0 | - | 4.76 | 63,416 |
| Six Letter Geography #3 | 0 | - | 4.52 | 77,310 |
| Seven Letter Geography #1 | 0 | - | 4.48 | 62,839 |
| Eight Letter Geography #1 | 0 | - | 4.42 | 36,338 |
| Five Letter Geography #1 | 0 | - | 4.48 | 143,961 |
| Random History by Country | 0 | - | 4.54 | 31,827 |
| Letter A Geography Chain | 0 | - | 4.52 | 64,186 |
| 6-Letter Movie Chain #3 | 0 | - | 4.43 | 33,109 |
| Fruit & Vegetable Varieties Quiz | 0 | - | 4.33 | 54,951 |
| Fruits by Picture | 0 | - | 4.20 | 742,534 |
| Plants as Key Ingredient | 0 | - | 4.38 | 43,580 |
| Answers are Beverages | 0 | - | 4.09 | 57,684 |
| Basic Cake Ingredients | 0 | - | 4.23 | 104,900 |
| Types of Food | 0 | - | 4.23 | 81,696 |
| The Foods they Ate | 0 | - | 4.06 | 66,925 |
| Animals Used in Food | 0 | - | 4.30 | 73,047 |
| Most Popular Fruits | 0 | - | 4.16 | 89,740 |
| Healthiest Fruits and Vegetables | 0 | - | 4.09 | 45,047 |
| 10 Most Popular Pizza Toppings | 0 | - | 4.06 | 78,664 |
| Valid Answer - World History #2 | 0 | - | 4.42 | 40,097 |
| Valid Answer - World History #1 | 0 | - | 4.58 | 57,021 |
| Name the Constellations - With a Map | 0 | - | 4.90 | 31,746 |
| Obfuscations of Movie Titles #1 | 0 | - | 4.90 | 51,274 |
| Song Titles with Shared First Words #1 | 0 | - | 4.87 | 21,676 |
| Five Biggest Immigrant Groups by Country #1 | 0 | - | 4.97 | 165,428 |
| Five Biggest Immigrant Groups by Country #2 | 0 | - | 4.91 | 79,513 |
| Top Five Countries By Fruit Production | 0 | - | 4.91 | 44,432 |
| The Only Country ... | 0 | - | 4.89 | 48,053 |
| 20 Random Countries on an Empty World Map | 0 | - | 4.98 | 103,250 |
| Random Countries by Borders | 0 | - | 4.99 | 67,451 |
| Top Five Countries by Random Categories | 0 | - | 4.96 | 111,259 |
| Random Name a Valid Country | 0 | - | 4.99 | 174,394 |
| Valentine's Day Decoder | 0 | - | 3.86 | 15,380 |
| Canada Decoder | 0 | - | 4.10 | 17,925 |
| World Countries by 10 Category Elimination #1 | 0 | - | 4.96 | 108,016 |
| Category Elimination - Countries #1 | 0 | - | 4.99 | 287,994 |
| Category Elimination - Countries #2 | 0 | - | 4.98 | 210,595 |
| Category Elimination - Countries #3 | 0 | - | 4.99 | 201,365 |
| Category Elimination - Countries #4 | 0 | - | 4.99 | 171,492 |
| Category Elimination - European Geography #3 | 0 | - | 4.87 | 67,640 |
| Name a Valid Island Country | 0 | - | 4.96 | 104,298 |
| Science Vocabulary #1 | 0 | - | 4.36 | 66,831 |
| Science Vocabulary #3 | 0 | - | 4.31 | 48,422 |
| Rocks and Minerals Picture Quiz | 0 | - | 4.47 | 27,376 |
| Elements by Picture | 0 | - | 4.30 | 64,237 |
| Medical Vocabulary | 0 | - | 4.53 | 54,152 |
| Two Letter Answers #2 | 0 | - | 4.40 | 79,960 |
| Two Letter Answers #4 | 0 | - | 4.26 | 83,973 |
| Two Letter Answers #1 | 0 | - | 4.30 | 102,224 |
| Three Letter Answers #2 | 0 | - | 4.09 | 69,208 |
| Two Letter Answers #3 | 0 | - | 4.16 | 77,700 |
| Three Letter Answers #1 | 0 | - | 4.32 | 71,098 |
| People With Place Names | 0 | - | 3.95 | 37,842 |
| People with Food Names | 0 | - | 4.02 | 53,281 |
| First Names of Historical Figures #2 | 0 | - | 4.37 | 35,642 |
| Translations of John | 0 | - | 4.45 | 24,295 |
| Italian Name Translation Quiz | 0 | - | 4.72 | 35,865 |
| Random Nicknames #1 | 0 | - | 4.06 | 33,427 |
| Birth Names | 0 | - | 4.32 | 59,681 |
| Most Common Last Names in the US | 0 | - | 4.33 | 200,572 |
| Famous Last Names #1 | 0 | - | 4.05 | 56,197 |
| Shared First Names #1 | 0 | - | 4.20 | 100,444 |
| Random Name Translation | 0 | - | 4.52 | 39,680 |
| Most Common Male First Names in the U.S. | 0 | - | 4.35 | 137,549 |
| Most Common Female First Names in the U.S. | 0 | - | 4.16 | 133,361 |
| First Names of Female Singers | 0 | - | 4.29 | 50,064 |
| People with A Initials | 0 | - | 4.18 | 57,029 |
| People with B Initials | 0 | - | 4.08 | 44,431 |
| People with C Initials | 0 | - | 4.08 | 45,986 |
| People with E Initials | 0 | - | 4.03 | 32,039 |
| People with M Initials | 0 | - | 4.17 | 52,328 |
| People with R Initials | 0 | - | 4.32 | 37,329 |
| People with S Initials | 0 | - | 4.05 | 35,559 |
| People with W Initials | 0 | - | 4.07 | 32,979 |
| Famous People Named George | 0 | - | 4.15 | 49,224 |
| Famous People Named Charles | 0 | - | 4.19 | 49,165 |
| Famous People Named Michael | 0 | - | 4.05 | 38,756 |
| Famous Catherines | 0 | - | 4.44 | 15,466 |
| People Who Were "The" Something | 0 | - | 4.22 | 130,125 |
| History Analogies #4 | 0 | - | 4.17 | 51,028 |
| Geography Analogies #5 | 0 | - | 4.24 | 51,341 |
