| Metals of Antiquity | 0 | - | 4.95 | 93,615 |
| Elements by Picture | 0 | - | 4.27 | 70,081 |
| Animals by Skeleton Image | 0 | - | 4.81 | 46,665 |
| Rocks and Minerals Picture Quiz | 0 | - | 4.48 | 29,386 |
| Former Countries by Territory Map | 0 | - | 4.96 | 103,119 |
| Empires by Maps | 0 | - | 4.98 | 120,964 |
| Planets By Picture Quiz | 0 | - | 4.49 | 57,020 |
| Flag Vocabulary Mega-Challenge | 0 | - | 4.34 | 27,262 |
| Merged Company Logos #1 | 0 | - | 4.90 | 106,798 |
| All Country Flags of the World | 0 | - | 5.00 | 3,680,646 |
| Elements Named for Countries | 0 | - | 4.53 | 24,802 |
| Words for Leaders | 0 | - | 4.77 | 257,800 |
| German Loan Words | 0 | - | 4.28 | 138,765 |
| Islands by Shape #2 | 0 | - | 4.88 | 59,348 |
| Visual Memory Test - Random Cartoons | 0 | - | 4.98 | 104,710 |
| Play-Doh People from History | 0 | - | 4.99 | 95,064 |
| Famous Landmarks Out Of Focus #1 | 0 | - | 4.89 | 61,245 |
| Jeppy in Disguise #1 | 0 | - | 4.92 | 49,567 |
| Jeppy in Disguise #2 | 0 | - | 4.96 | 49,698 |
| Circular Cutouts from a World Map | 0 | - | 4.98 | 61,756 |
| Country Flags Quiz #1 | 0 | - | 4.98 | 2,540,150 |
| Country Flags Quiz #2 | 0 | - | 4.99 | 1,094,347 |
| Country Flags Quiz #3 | 0 | - | 4.97 | 734,435 |
| Make a Stained Glass Window | 0 | - | 5.00 | 68,692 |
| Flags with Crescents | 0 | - | 4.98 | 170,122 |
| Country Flag Trivia | 0 | - | 4.81 | 57,368 |
| Country Flags with Eagles - Picture Quiz | 0 | - | 4.98 | 104,148 |
| Country Flags with the Union Jack | 0 | - | 4.87 | 77,817 |
| Pixelated Flag Quiz | 0 | - | 4.97 | 87,802 |
| Flag Emblems Scavenger Hunt | 0 | - | 5.00 | 67,499 |
| Flags by Horizontal Stripes #1 | 0 | - | 4.84 | 85,490 |
| Country Flags with the Sun - Picture Quiz | 0 | - | 4.83 | 53,053 |
| Real vs. Fake Flags | 0 | - | 4.98 | 124,735 |
| Ultimate Car Logos Quiz | 0 | - | 4.81 | 181,835 |
| National Football Team Logos | 0 | - | 4.85 | 180,865 |
| Countries with the Highest Carbon Dioxide Emissions | 0 | - | 4.97 | 109,763 |
| Years in History by Picture | 0 | - | 4.44 | 35,609 |
| Famous Foreheads #1 | 0 | - | 4.47 | 75,097 |
| Flags to Languages | 0 | - | 4.95 | 173,927 |
| Merged Company Logos #2 | 0 | - | 4.75 | 77,778 |
| Similar Country Flags - Multiple Choice Quiz | 0 | - | 4.94 | 50,702 |
| The Voyage of Darwin - Animated Map Quiz | 0 | - | 4.99 | 14,523 |
| Countries Reducing Carbon Dioxide Emissions the Most | 0 | - | 4.89 | 64,754 |
| Countries with the Most Forest | 0 | - | 4.87 | 147,694 |
| Countries with Glaciers | 0 | - | 4.97 | 105,560 |
| Three Real and One Fake - Country Flags | 0 | - | 4.97 | 84,328 |
| Fruits by Picture | 0 | - | 4.19 | 807,999 |
| Old Movies by Picture | 0 | - | 4.51 | 25,150 |
| Musical Instruments by Picture #2 | 0 | - | 4.24 | 47,134 |
| 1980s Movie Silhouettes | 0 | - | 4.97 | 104,119 |
| Pick a Picture - Animal Relations | 0 | - | 4.94 | 55,594 |
| Name that Historical Figure #1 | 0 | - | 4.63 | 338,150 |
| Geography by Picture - B | 0 | - | 4.42 | 55,677 |
| Geography by Picture - H | 0 | - | 4.50 | 58,282 |
| Geography by Picture - N | 0 | - | 4.45 | 42,252 |
| Geography by Picture - R | 0 | - | 4.56 | 41,072 |
| Geography by Picture - T | 0 | - | 4.54 | 57,902 |
| Country Flags Multiple Choice | 0 | - | 4.97 | 144,848 |
| Name the Pixelated Landmark | 0 | - | 4.84 | 63,171 |
| Car Logos Quiz #1 | 0 | - | 4.52 | 540,963 |
| Random Logos Quiz | 0 | - | 4.33 | 208,804 |
| All North American Pro Sports Logos | 0 | - | 4.70 | 115,585 |
| Brand Logos Quiz #1 | 0 | - | 4.83 | 2,428,812 |
| Pictures by Letter - A | 0 | - | 4.18 | 33,513 |
| Pictures by Letter - J | 0 | - | 4.31 | 40,136 |
| Pictures by Letter - B | 0 | - | 4.32 | 44,086 |
| Pictures by Letter - D | 0 | - | 4.14 | 37,683 |
| Pictures by Letter - M | 0 | - | 4.24 | 37,880 |
| Body Parts in History and Culture | 0 | - | 4.43 | 35,371 |
| Name the Constellations - With a Map | 0 | - | 4.92 | 36,021 |
| NCAA Football Team Name Vocabulary | 0 | - | 4.23 | 20,400 |
| Military History Vocabulary | 0 | - | 4.91 | 67,301 |
| Name that Bug | 0 | - | 4.12 | 45,588 |
| Islands by Shape #1 | 0 | - | 4.33 | 84,420 |
| 1970s Celebrities by Picture #1 | 0 | - | 4.20 | 58,052 |
| 1970s Celebrities by Picture #2 | 0 | - | 4.21 | 50,774 |
| Islands by Picture | 0 | - | 4.28 | 107,261 |
| Name that Object #1 | 0 | - | 3.57 | 96,536 |
| Classic Movies by Movie Posters | 0 | - | 4.45 | 24,314 |
| WWII Figures by Picture | 0 | - | 4.89 | 65,779 |
| Famous Landmarks Out Of Focus #2 | 0 | - | 4.37 | 41,358 |
| Animals by Close-up Image | 0 | - | 4.42 | 218,568 |
| Aquatic Mammals by Picture | 0 | - | 4.41 | 45,784 |
| Extinct Animals by Picture | 0 | - | 4.49 | 35,333 |
| Mammals by Picture #1 | 0 | - | 4.70 | 92,033 |
| 1940s Celebrities by Picture | 0 | - | 4.43 | 48,090 |
| International Footballers by Picture | 0 | - | 4.50 | 55,901 |
| Name that Historical Figure #2 | 0 | - | 4.42 | 285,084 |
| Name that Historical Figure #5 | 0 | - | 4.43 | 108,006 |
| Name that Historical Figure #7 - U.S. Edition | 0 | - | 4.51 | 50,960 |
| Geography by Picture - A | 0 | - | 4.39 | 60,327 |
| Geography by Picture - D | 0 | - | 4.15 | 45,711 |
| Geography by Picture - F | 0 | - | 4.31 | 51,072 |
| Geography by Picture - G | 0 | - | 4.39 | 48,001 |
| Geography by Picture - J | 0 | - | 4.16 | 38,515 |
| Geography by Picture - K | 0 | - | 4.29 | 33,175 |
| Geography by Picture - C | 0 | - | 4.31 | 57,130 |
| Geography by Picture - L | 0 | - | 4.37 | 59,040 |
| Geography by Picture - M | 0 | - | 4.14 | 40,507 |
| Geography by Picture - P | 0 | - | 4.24 | 42,481 |
| Geography by Picture - S | 0 | - | 4.38 | 47,089 |
| Miscellaneous Flags Quiz | 0 | - | 4.42 | 281,010 |
| Flag Coloring Book Puzzle #1 | 0 | - | 4.96 | 171,981 |
| Flag Maths | 0 | - | 4.64 | 57,792 |
| Satellite Images #1 | 0 | - | 4.47 | 129,489 |
| Satellite Images Quiz #2 | 0 | - | 4.63 | 109,405 |
| Satellite Images Quiz #4 | 0 | - | 4.55 | 88,994 |
| Satellite Images Quiz #5 | 0 | - | 4.52 | 50,010 |
| Satellite Images Quiz #6 | 0 | - | 4.50 | 39,045 |
| Cities by Picture #1 | 0 | - | 4.73 | 86,186 |
| Soccer Team Logos | 0 | - | 4.26 | 375,660 |
| Car Logos Quiz #2 | 0 | - | 4.43 | 262,672 |
| Video Game Logos Quiz | 0 | - | 4.40 | 184,379 |
| Movie Logos | 0 | - | 4.33 | 239,156 |
| Brand Logos That Start with A | 0 | - | 4.52 | 70,674 |
| History by Picture - A | 0 | - | 4.26 | 45,937 |
| History by Picture - B | 0 | - | 4.40 | 49,123 |
| History by Picture - C | 0 | - | 4.36 | 54,639 |
| History by Picture - F | 0 | - | 4.35 | 38,003 |
| History by Picture - G | 0 | - | 4.40 | 42,253 |
| History by Picture - D | 0 | - | 4.29 | 44,442 |
| History by Picture - E | 0 | - | 4.25 | 44,057 |
| History by Picture - H | 0 | - | 4.37 | 36,898 |
| History by Picture - K | 0 | - | 4.35 | 33,456 |
| History by Picture - M | 0 | - | 4.17 | 36,234 |
| History by Picture - N | 0 | - | 4.40 | 41,361 |
| History by Picture - O | 0 | - | 4.39 | 36,401 |
| History by Picture - T | 0 | - | 4.20 | 33,395 |
| Name that Nut, Seed, or Bean | 0 | - | 4.63 | 57,419 |
| Animals - Taxonomy to Common Name | 0 | - | 4.80 | 28,339 |
| Countries with the Most HIV | 0 | - | 4.46 | 44,481 |
| Countries with the Most Malaria Deaths | 0 | - | 4.45 | 45,384 |
| Countries that Desalinate the Most Water | 0 | - | 4.77 | 41,747 |
| Play Scrabble by Guessing Countries | 0 | - | 4.97 | 132,585 |
| Art Works Picture Quiz #1 | 0 | - | 4.51 | 119,484 |
| Art Works Picture Quiz #2 | 0 | - | 4.49 | 105,546 |
| Musical Instruments by Picture #1 | 0 | - | 4.52 | 269,253 |
| Foods by Picture | 0 | - | 3.81 | 226,278 |
| Flowers by Picture | 0 | - | 4.46 | 105,731 |
| Junk Foods by Picture | 0 | - | 3.69 | 96,493 |
| Art Works Picture Quiz #3 | 0 | - | 4.45 | 48,836 |
| Christmas by Picture | 0 | - | 4.26 | 28,202 |
| Name that Object #2 | 0 | - | 3.64 | 15,470 |
| Hats by Picture | 0 | - | 4.21 | 17,989 |
| Weapons by Picture | 0 | - | 4.13 | 21,102 |
| Cars by Picture | 0 | - | 3.89 | 41,620 |
| Reptile Picture Quiz | 0 | - | 4.32 | 14,319 |
| Authors by Picture | 0 | - | 4.48 | 25,561 |
| Plants by Picture | 0 | - | 4.24 | 14,480 |
| Name that Object #3 | 0 | - | 3.93 | 14,425 |
| Fruit and Vegetable Emojis | 0 | - | 4.45 | 90,353 |
| College Sports Logos Quiz #3 | 0 | - | 4.30 | 55,954 |
| Songs by Picture Quiz #1 | 0 | - | 4.68 | 66,185 |
| Songs by Picture Quiz #2 | 0 | - | 4.42 | 59,033 |
| Fish by Picture #1 | 0 | - | 4.41 | 108,645 |
| Animals A-Z by Picture | 0 | - | 4.08 | 66,611 |
| Mammals by Picture #3 | 0 | - | 4.39 | 62,283 |
| Mammals by Picture #4 | 0 | - | 4.03 | 34,209 |
| Birds by Picture #1 | 0 | - | 4.47 | 41,813 |
| Mammals by Picture #2 | 0 | - | 4.28 | 58,358 |
| Oscar Nominated Actors by Picture #1 | 0 | - | 4.42 | 165,358 |
| 1960s Celebrities by Picture #1 | 0 | - | 4.27 | 70,546 |
| 1960s Celebrities by Picture #2 | 0 | - | 4.26 | 51,517 |
| 1950s Celebrities by Picture #1 | 0 | - | 4.24 | 51,248 |
| 1980s Celebrities by Picture #2 | 0 | - | 4.19 | 71,860 |
| 1990s Celebrities by Picture #1 | 0 | - | 4.14 | 79,549 |
| 1990s Celebrities by Picture #2 | 0 | - | 4.16 | 72,577 |
| 2000s Celebrities by Picture #2 | 0 | - | 4.15 | 95,764 |
| Women in History by Picture | 0 | - | 4.25 | 25,963 |
| 1950s Celebrities by Picture #2 | 0 | - | 4.29 | 46,231 |
| Name that Historical Figure #3 | 0 | - | 4.36 | 239,847 |
| Name that Historical Figure #4 | 0 | - | 4.29 | 159,482 |
| Name that Historical Figure #6 | 0 | - | 4.26 | 93,595 |
| Musicians by Picture #1 | 0 | - | 4.37 | 109,245 |
| Musicians by Picture #2 | 0 | - | 4.29 | 76,781 |
| Musicians by Picture #4 | 0 | - | 4.07 | 65,161 |
| Musicians by Picture #3 | 0 | - | 4.10 | 59,180 |
| Geography by Picture - E | 0 | - | 3.55 | 47,427 |
| Landforms by Picture | 0 | - | 4.31 | 20,701 |
| Geography by Picture - I | 0 | - | 4.00 | 39,469 |
| Geography by Picture - O | 0 | - | 4.01 | 28,176 |
| Emoji Flags | 0 | - | 4.35 | 44,154 |
| Fill the Map of Europe by Guessing Flag Colors | 0 | - | 4.68 | 37,996 |
| Languages by Combined Flags | 0 | - | 4.53 | 100,233 |
| Satellite Images Quiz #3 | 0 | - | 4.35 | 73,451 |
| Satellite Images - Island Chains | 0 | - | 4.43 | 66,624 |
| Islands by Satellite Image #1 | 0 | - | 4.70 | 70,917 |
| Peninsulas by Satellite Image | 0 | - | 4.53 | 27,856 |
| Landmarks Picture Quiz #1 | 0 | - | 4.16 | 394,959 |
| Airline Logos | 0 | - | 4.45 | 141,001 |
| Brand Logos Quiz #2 | 0 | - | 4.70 | 1,692,955 |
| Brand Logos Quiz #4 | 0 | - | 4.45 | 1,014,566 |
| Fast Food Logos Quiz | 0 | - | 4.45 | 248,802 |
| Mostly-American Candy Logos | 0 | - | 4.14 | 159,389 |
| Brand Logos That Start With M | 0 | - | 4.40 | 63,106 |
| Brand Logos That Start With S | 0 | - | 4.37 | 57,890 |
| Brand Logos That Start With B | 0 | - | 4.38 | 60,257 |
| Brand Logos That Start With D | 0 | - | 4.35 | 61,806 |
| Brand Logos That Start With L | 0 | - | 4.39 | 61,441 |
| Brand Logos That Start With C | 0 | - | 4.20 | 49,859 |
