| Deadliest U.S. Wars | 0 | - | 4.89 | 189,645 |
| Africa Geography Quiz #1 | 0 | - | 4.93 | 49,159 |
| U.S. History for Dummies | 0 | - | 4.47 | 82,677 |
| US States Quiz | 0 | - | 5.00 | 16,761,488 |
| All 3,143 Counties of the United States on a Map | 0 | - | 4.97 | 329,337 |
| U.S. History Groups of Two | 0 | - | 4.23 | 44,322 |
| French Geography Quiz #1 | 0 | - | 4.89 | 34,610 |
| South American Geography Quiz #2 | 0 | - | 4.61 | 39,242 |
| South American Geography Quiz #1 | 0 | - | 4.73 | 32,508 |
| 10 Longest Rivers in the United States | 0 | - | 4.85 | 38,909 |
| Countries Closest to United States by Continent | 0 | - | 4.99 | 145,738 |
| American History Quotes #1 | 0 | - | 4.37 | 95,770 |
| American History Quotes #2 | 0 | - | 4.38 | 41,261 |
| Last Names in U.S. History #1 | 0 | - | 4.25 | 36,130 |
| Louisiana Purchase with a Map | 0 | - | 4.96 | 47,982 |
| US States with an Empty Map | 0 | - | 5.00 | 620,853 |
| Canadian Prime Ministers | 0 | - | 4.63 | 57,237 |
| Countries that Beat Canada | 0 | - | 4.90 | 87,069 |
| U.S. States or European Countries by Area | 0 | - | 4.95 | 95,189 |
| U.S. States or European Countries by Population | 0 | - | 4.97 | 132,377 |
| Asian Last Names in the United States | 0 | - | 4.43 | 46,582 |
| Rivers of the United States | 0 | - | 4.93 | 65,742 |
| Countries Closest to Alaska | 0 | - | 4.93 | 123,701 |
| Countries Closest to Maine | 0 | - | 4.84 | 66,688 |
| Name a Valid U.S. State #1 | 0 | - | 4.93 | 207,411 |
| Great Plains States and Provinces on a Map | 0 | - | 4.95 | 48,899 |
| Top 10 Coldest U.S. States | 0 | - | 4.94 | 124,147 |
| Top 10 Hottest U.S. States | 0 | - | 4.86 | 124,993 |
| Top 10 Most Native American U.S. States | 0 | - | 4.87 | 91,427 |
| Top 10 U.S. States with the Least Precipitation | 0 | - | 4.82 | 61,665 |
| U.S. States that Border Canada | 0 | - | 4.91 | 183,400 |
| U.S. States that Start with M - Shape Quiz | 0 | - | 4.94 | 57,826 |
| O Canada Lyrics | 0 | - | 4.47 | 50,859 |
| Canada Provinces and Territories | 0 | - | 5.00 | 339,417 |
| Canada Provinces Map Quiz | 0 | - | 4.99 | 637,382 |
| Countries of Europe - One Minute Sprint | 0 | - | 4.94 | 1,322,590 |
| Africa Geography Quiz #2 | 0 | - | 4.59 | 32,871 |
| American Founding Fathers | 0 | - | 4.41 | 23,096 |
| California Groups of Things | 0 | - | 4.25 | 45,323 |
| New York Groups of Things | 0 | - | 4.38 | 60,012 |
| People on Money - United States | 0 | - | 4.31 | 63,251 |
| 100 Most Influential Figures in U.S. History | 0 | - | 4.20 | 44,799 |
| Last Names in U.S. History #2 | 0 | - | 4.39 | 17,541 |
| Fifty US States in One Minute | 0 | - | 4.56 | 3,524,939 |
| Category Elimination - U.S. States #1 | 0 | - | 4.88 | 219,320 |
| Category Elimination - U.S. States #2 | 0 | - | 4.82 | 133,105 |
| Famous Canadians by Picture | 0 | - | 4.39 | 49,208 |
| Europe Geography Quiz #1 | 0 | - | 4.54 | 71,096 |
| Europe Geography Quiz #2 | 0 | - | 4.57 | 71,738 |
| Europe Geography Quiz #4 | 0 | - | 4.57 | 70,042 |
| Europe Geography Quiz #5 | 0 | - | 4.54 | 61,086 |
| States of the German Confederation in 1848 | 0 | - | 4.89 | 31,706 |
| Asia Geography Quiz #1 | 0 | - | 4.70 | 53,389 |
| Asia Geography Quiz #2 | 0 | - | 4.56 | 48,406 |
| Asia Geography Quiz #3 | 0 | - | 4.49 | 32,186 |
| American Countries with the Shortest Names | 0 | - | 4.96 | 120,659 |
| Movies by State | 0 | - | 4.27 | 40,481 |
| Countries of Europe in 1815 With a Map | 0 | - | 4.99 | 149,406 |
| Countries of Europe in 1848 | 0 | - | 4.98 | 75,759 |
| Countries of Europe in 1870 with a Map | 0 | - | 4.95 | 63,864 |
| Every Country of Europe Since 1815 With a Map | 0 | - | 4.98 | 70,409 |
| Asian Countries with the Shortest Names | 0 | - | 4.97 | 134,695 |
| Countries of the Mongol Empire on a Map | 0 | - | 4.99 | 106,221 |
| Category Elimination - African Geography #1 | 0 | - | 4.90 | 91,478 |
| Name a Valid African Country | 0 | - | 4.98 | 153,309 |
| Oceania Geography Quiz | 0 | - | 4.55 | 22,007 |
| U.S. Geography by Letter - B | 0 | - | 4.53 | 68,943 |
| U.S. Geography by Letter - S | 0 | - | 4.55 | 52,428 |
| Mexico Country Quiz | 0 | - | 4.49 | 72,146 |
| Mexico Cities Map Quiz | 0 | - | 4.77 | 33,361 |
| Colombia Country Quiz | 0 | - | 4.90 | 40,474 |
| 15 Largest Cities in North America With a Map | 0 | - | 4.98 | 46,723 |
| 100 Biggest Cities in North America on a Map | 0 | - | 4.84 | 61,774 |
| Two Letter U.S. State Abbreviations | 0 | - | 4.19 | 744,740 |
| Biggest Cities in the U.S. - Extreme | 0 | - | 4.96 | 158,615 |
| U.S. Five-Star Generals and Admirals | 0 | - | 4.33 | 8,312 |
| Most Common U.S. Last Names - Extreme | 0 | - | 4.94 | 173,637 |
| Biggest Cities in Each U.S. State - Extreme | 0 | - | 4.93 | 78,956 |
| 10 Biggest Cities by U.S. State | 0 | - | 4.95 | 41,144 |
| Random U.S. City to State | 0 | - | 4.45 | 75,560 |
| 500 Biggest U.S. Urban Areas | 0 | - | 4.90 | 115,948 |
| U.S. Federal Agency Acronyms | 0 | - | 4.50 | 79,822 |
| All U.S. Supreme Court Justices | 0 | - | 4.54 | 28,939 |
| All U.S. Supreme Court Justices Ever | 0 | - | 4.49 | 11,692 |
| U.S. Presidents Quiz | 0 | - | 5.00 | 3,669,877 |
| 10 Closest Megacities to New York City | 0 | - | 4.52 | 67,234 |
| U.S. States by First Two Letters in 30 Seconds | 0 | - | 4.69 | 1,384,467 |
| US States by Borders in 30 Seconds | 0 | - | 4.69 | 2,670,287 |
| Most Valuable Crops by U.S. State | 0 | - | 4.40 | 38,992 |
| Most-Visited Countries by Canadians | 0 | - | 4.82 | 39,153 |
| Countries Closest to Canada | 0 | - | 4.90 | 197,634 |
| Europe Geography Quiz #3 | 0 | - | 4.34 | 63,487 |
| Biggest Countries in Europe in 1700 | 0 | - | 4.73 | 58,267 |
| Category Elimination - European Geography #1 | 0 | - | 4.98 | 231,501 |
| European Map without 10 Random Countries | 0 | - | 4.97 | 275,443 |
| Category Elimination - European Geography #2 | 0 | - | 4.99 | 165,892 |
| Category Elimination - European Countries #1 | 0 | - | 4.89 | 89,366 |
| Name a Valid European Country #1 | 0 | - | 4.99 | 258,225 |
| Name a Valid European Country #2 | 0 | - | 4.94 | 113,739 |
| Modern-Day Countries of the British Empire in 1921 | 0 | - | 4.99 | 116,716 |
| Name the English Monarchs | 0 | - | 4.92 | 499,593 |
| Category Elimination - Asian Geography #1 | 0 | - | 4.85 | 109,167 |
| Category Elimination - Asian Geography #2 | 0 | - | 4.94 | 95,948 |
| Name a Valid Asian Country | 0 | - | 4.98 | 120,374 |
| Topological Map of Africa Quiz | 0 | - | 4.80 | 21,223 |
| Countries Bordering Brazil | 0 | - | 4.96 | 131,252 |
| Countries That Visit Brazil The Most | 0 | - | 4.95 | 49,382 |
| Countries that Beat Brazil | 0 | - | 4.49 | 68,142 |
| Costa Rica Country Quiz | 0 | - | 4.75 | 32,008 |
| Cuba Country Quiz | 0 | - | 4.69 | 51,291 |
| Names of Generations | 0 | - | 4.00 | 22,960 |
| U.S. Cities with the Biggest Economies | 0 | - | 4.84 | 72,340 |
| 10 U.S. States With The Lowest Murder Rates | 0 | - | 4.51 | 41,432 |
| Biggest Trading Partners - United States | 0 | - | 4.63 | 106,467 |
| Countries that Beat the United States | 0 | - | 4.93 | 166,028 |
| Arms Exports - United States | 0 | - | 4.75 | 61,631 |
| U.S. Bill of Rights | 0 | - | 4.53 | 32,411 |
| State Quiz - Alaska | 0 | - | 4.42 | 41,887 |
| State Quiz - Arizona | 0 | - | 4.44 | 36,580 |
| California Cities Map Quiz | 0 | - | 4.50 | 87,749 |
| Fictional Characters from California by Picture | 0 | - | 4.23 | 22,485 |
| State Quiz - California | 0 | - | 4.68 | 64,137 |
| State Quiz - Florida | 0 | - | 4.47 | 62,091 |
| Florida Cities Map Quiz | 0 | - | 4.48 | 60,715 |
| Countries that Visit Florida the Most | 0 | - | 4.72 | 71,650 |
| State Quiz - Georgia | 0 | - | 4.48 | 35,409 |
| Countries Closest to Hawaii | 0 | - | 4.54 | 53,363 |
| State Quiz - Illinois | 0 | - | 4.44 | 33,239 |
| State Quiz - Kentucky | 0 | - | 4.41 | 32,325 |
| State Quiz - Minnesota | 0 | - | 4.41 | 38,653 |
| New York Cities Map Quiz | 0 | - | 4.54 | 42,098 |
| Fictional Characters from New York | 0 | - | 4.09 | 21,381 |
| State Quiz - New York | 0 | - | 4.52 | 45,884 |
| State Quiz - New Jersey | 0 | - | 4.42 | 37,989 |
| State Quiz - Texas | 0 | - | 4.43 | 62,645 |
| Six Flags Over Texas | 0 | - | 4.78 | 63,116 |
| State Quiz - Pennsylvania | 0 | - | 4.50 | 48,772 |
| State Quiz - Tennessee | 0 | - | 4.54 | 33,998 |
| State Quiz - Virginia | 0 | - | 4.52 | 40,138 |
| State Quiz - Washington | 0 | - | 4.45 | 36,257 |
| U.S. History A-Z #1 | 0 | - | 4.35 | 29,720 |
| U.S. State Quarters Picture Quiz #1 | 0 | - | 4.45 | 52,719 |
| U.S. State Quarters Picture Quiz #2 | 0 | - | 4.74 | 38,373 |
| U.S. States by Clue #1 | 0 | - | 4.50 | 38,779 |
| U.S. License Plates Picture Quiz | 0 | - | 4.59 | 52,740 |
| U.S. States with the Fewest Immigrants | 0 | - | 4.63 | 65,555 |
| U.S. States with More Cows than People | 0 | - | 4.70 | 46,348 |
| U.S. States by Coldest Recorded Temperature | 0 | - | 4.51 | 66,304 |
| 10 U.S. States With The Highest Murder Rates | 0 | - | 4.47 | 53,500 |
| U.S. States with Spanish Names | 0 | - | 4.50 | 87,529 |
| States and Provinces that touch the Rocky Mountains | 0 | - | 4.42 | 32,442 |
| Name a Valid U.S. State #2 | 0 | - | 4.63 | 76,654 |
| Walking Across U.S. State Borders with Hints | 0 | - | 4.74 | 34,963 |
| Name a Valid U.S. State #3 | 0 | - | 4.78 | 48,816 |
| U.S. States with the Longest International Borders | 0 | - | 4.78 | 45,667 |
| Longest U.S. State Borders | 0 | - | 4.67 | 39,543 |
| U.S. State Superlatives #1 | 0 | - | 4.47 | 87,354 |
| U.S. State Superlatives #2 | 0 | - | 4.53 | 40,530 |
| Musical Acts by State | 0 | - | 4.05 | 19,565 |
| Tourist Attractions by U.S. State | 0 | - | 4.46 | 62,501 |
| Top 10 U.S. States With the Most Tornadoes | 0 | - | 4.53 | 64,570 |
| Top 10 Least Religious U.S. States | 0 | - | 4.51 | 34,168 |
| Top 10 U.S. States by Public Transit | 0 | - | 4.77 | 63,536 |
| Top 10 U.S. States with the Most Precipitation | 0 | - | 4.46 | 41,617 |
| U.S. States with the Fewest Borders | 0 | - | 4.77 | 113,206 |
| U.S. States with the Most Borders | 0 | - | 4.53 | 62,257 |
| U.S. State Capitals Quiz | 0 | - | 5.00 | 1,681,678 |
| Countries that Beat Russia | 0 | - | 4.81 | 82,183 |
| The Trojan War | 0 | - | 4.83 | 39,534 |
| Letters of the Greek Alphabet | 0 | - | 4.97 | 643,986 |
| Name that Greek Letter | 0 | - | 4.93 | 322,323 |
| Greek Mythology General Knowledge #1 | 0 | - | 4.85 | 111,033 |
| Famous Italian-Americans | 0 | - | 4.15 | 14,372 |
| Ancient Roman Trivia #1 | 0 | - | 4.85 | 84,227 |
| Roman Emperors | 0 | - | 4.95 | 119,043 |
| Countries that Beat Portugal | 0 | - | 4.86 | 58,899 |
| British History Quiz for Dummies | 0 | - | 4.70 | 78,299 |
| Prime Ministers of the UK | 0 | - | 4.96 | 436,211 |
| Countries that Beat Indonesia | 0 | - | 4.86 | 55,437 |
| Colonies of Africa with a Map | 0 | - | 4.78 | 54,147 |
| Random Sequential Oceanic Countries on a Map | 0 | - | 4.97 | 26,985 |
| U.S. Geography by Letter - C | 0 | - | 4.27 | 73,709 |
| U.S. Geography by Letter - A | 0 | - | 4.38 | 62,671 |
| U.S. Geography by Letter - D | 0 | - | 4.08 | 56,666 |
| U.S. Geography by Letter - T | 0 | - | 4.29 | 49,336 |
| U.S. Geography by Letter - P | 0 | - | 4.36 | 47,780 |
| U.S. Geography by Letter - M | 0 | - | 4.14 | 52,930 |
| U.S. Geography by Letter - L | 0 | - | 4.04 | 40,770 |
| U.S. Geography by Letter - G | 0 | - | 4.13 | 38,906 |
| U.S. Geography By Letter - H | 0 | - | 4.35 | 39,693 |
| Biggest Trading Partners - Colombia | 0 | - | 4.88 | 40,085 |
| Panama Country Quiz | 0 | - | 4.61 | 25,671 |
| Dominican Republic Country Quiz | 0 | - | 4.61 | 23,285 |
| U.S. Cities Chain | 0 | - | 4.21 | 35,276 |
| Topological Map of the USA Quiz | 0 | - | 4.49 | 28,939 |
| Free in the Answers | 0 | - | 4.11 | 51,338 |
| States that Beat Alaska | 0 | - | 4.49 | 26,428 |
| Famous People from California by Picture | 0 | - | 4.32 | 36,259 |
| History of Florida | 0 | - | 4.45 | 9,784 |
| Hawaiian Islands Map Quiz | 0 | - | 4.78 | 22,219 |
