| Countries with the Highest Carbon Dioxide Emissions | 0 | - | 4.97 | 109,620 |
| Countries with the Most Forest | 0 | - | 4.87 | 146,908 |
| Countries with Glaciers | 0 | - | 4.97 | 104,876 |
| Elements by Picture | 0 | - | 4.27 | 69,752 |
| Rocks and Minerals Picture Quiz | 0 | - | 4.48 | 29,233 |
| Former Countries by Territory Map | 0 | - | 4.96 | 102,237 |
| Empires by Maps | 0 | - | 4.98 | 119,467 |
| Animals by Skeleton Image | 0 | - | 4.80 | 46,213 |
| Merged Company Logos #1 | 0 | - | 4.91 | 105,965 |
| Countries that Desalinate the Most Water | 0 | - | 4.77 | 41,491 |
| Planets By Picture Quiz | 0 | - | 4.49 | 56,496 |
| Least-Forested Countries | 0 | - | 4.53 | 65,055 |
| Tropical Rainforest Countries | 0 | - | 4.68 | 81,890 |
| Northernmost Countries Without Glaciers | 0 | - | 4.62 | 36,111 |
| Islands by Shape #2 | 0 | - | 4.88 | 59,118 |
| Visual Memory Test - Random Cartoons | 0 | - | 4.98 | 103,513 |
| Play-Doh People from History | 0 | - | 4.99 | 94,341 |
| Famous Landmarks Out Of Focus #1 | 0 | - | 4.89 | 60,659 |
| Jeppy in Disguise #1 | 0 | - | 4.92 | 49,047 |
| Jeppy in Disguise #2 | 0 | - | 4.96 | 49,227 |
| Circular Cutouts from a World Map | 0 | - | 4.98 | 61,290 |
| All Country Flags of the World | 0 | - | 5.00 | 3,632,815 |
| Metals of Antiquity | 0 | - | 4.94 | 93,168 |
| Country Flags Quiz #1 | 0 | - | 4.98 | 2,531,679 |
| Country Flags Quiz #2 | 0 | - | 4.98 | 1,089,989 |
| Country Flags Quiz #3 | 0 | - | 4.98 | 731,615 |
| Countries with Tropical Rainforest and Glaciers | 0 | - | 4.51 | 55,531 |
| Years in History by Picture | 0 | - | 4.44 | 35,340 |
| Make a Stained Glass Window | 0 | - | 5.00 | 68,166 |
| Famous Foreheads #1 | 0 | - | 4.47 | 74,557 |
| Flags with Crescents | 0 | - | 4.98 | 168,539 |
| Country Flag Trivia | 0 | - | 4.81 | 56,483 |
| Country Flags with Eagles - Picture Quiz | 0 | - | 4.98 | 103,058 |
| Country Flags with the Union Jack | 0 | - | 4.87 | 76,974 |
| Pixelated Flag Quiz | 0 | - | 4.98 | 86,628 |
| Flag Emblems Scavenger Hunt | 0 | - | 5.00 | 66,881 |
| Flags by Horizontal Stripes #1 | 0 | - | 4.84 | 84,758 |
| Badly Drawn Flags #1 | 0 | - | 4.99 | 60,208 |
| Country Flags with the Sun - Picture Quiz | 0 | - | 4.83 | 52,428 |
| Real vs. Fake Flags | 0 | - | 4.98 | 123,360 |
| National Football Team Logos | 0 | - | 4.85 | 179,576 |
| Merged Company Logos #2 | 0 | - | 4.75 | 77,145 |
| Name that Object #1 | 0 | - | 3.56 | 96,409 |
| Flags to Languages | 0 | - | 4.95 | 173,073 |
| Similar Country Flags - Multiple Choice Quiz | 0 | - | 4.94 | 50,232 |
| The Voyage of Darwin - Animated Map Quiz | 0 | - | 4.99 | 14,413 |
| Countries Reducing Carbon Dioxide Emissions the Most | 0 | - | 4.89 | 64,422 |
| Fruits by Picture | 0 | - | 4.20 | 806,000 |
| Old Movies by Picture | 0 | - | 4.51 | 24,979 |
| Musical Instruments by Picture #2 | 0 | - | 4.24 | 46,852 |
| Geography by Picture - B | 0 | - | 4.42 | 55,508 |
| Geography by Picture - H | 0 | - | 4.50 | 58,127 |
| Geography by Picture - N | 0 | - | 4.45 | 42,119 |
| Geography by Picture - R | 0 | - | 4.56 | 40,948 |
| Geography by Picture - T | 0 | - | 4.54 | 57,755 |
| Random Logos Quiz | 0 | - | 4.31 | 207,753 |
| All North American Pro Sports Logos | 0 | - | 4.70 | 114,241 |
| Pictures by Letter - A | 0 | - | 4.17 | 33,278 |
| Pictures by Letter - J | 0 | - | 4.31 | 39,889 |
| Pictures by Letter - B | 0 | - | 4.31 | 43,781 |
| Pictures by Letter - D | 0 | - | 4.13 | 37,459 |
| Pictures by Letter - M | 0 | - | 4.24 | 37,671 |
| Body Parts in History and Culture | 0 | - | 4.42 | 35,219 |
| Three Real and One Fake - Country Flags | 0 | - | 4.97 | 83,657 |
| Pick a Picture - Animal Relations | 0 | - | 4.94 | 55,131 |
| Name that Historical Figure #1 | 0 | - | 4.63 | 336,603 |
| Name the Pixelated Landmark | 0 | - | 4.84 | 62,727 |
| Car Logos Quiz #1 | 0 | - | 4.44 | 535,773 |
| Name the Constellations - With a Map | 0 | - | 4.92 | 35,799 |
| Name that Bug | 0 | - | 4.12 | 45,507 |
| Islands by Shape #1 | 0 | - | 4.32 | 84,259 |
| 1970s Celebrities by Picture #1 | 0 | - | 4.20 | 57,797 |
| 1970s Celebrities by Picture #2 | 0 | - | 4.21 | 50,553 |
| Name that Object #2 | 0 | - | 3.64 | 15,382 |
| Islands by Picture | 0 | - | 4.29 | 106,418 |
| Name that Object #3 | 0 | - | 3.93 | 14,348 |
| Classic Movies by Movie Posters | 0 | - | 4.45 | 24,172 |
| 1980s Movie Silhouettes | 0 | - | 4.97 | 103,255 |
| Famous Landmarks Out Of Focus #2 | 0 | - | 4.37 | 41,020 |
| Animals by Close-up Image | 0 | - | 4.42 | 217,379 |
| Aquatic Mammals by Picture | 0 | - | 4.41 | 45,449 |
| Extinct Animals by Picture | 0 | - | 4.49 | 35,079 |
| Mammals by Picture #1 | 0 | - | 4.70 | 91,468 |
| 1940s Celebrities by Picture | 0 | - | 4.43 | 47,895 |
| International Footballers by Picture | 0 | - | 4.50 | 55,181 |
| Name that Historical Figure #2 | 0 | - | 4.41 | 283,729 |
| Name that Historical Figure #5 | 0 | - | 4.43 | 107,197 |
| Name that Historical Figure #7 - U.S. Edition | 0 | - | 4.50 | 50,588 |
| Geography by Picture - A | 0 | - | 4.39 | 60,141 |
| Geography by Picture - D | 0 | - | 4.15 | 45,568 |
| Geography by Picture - F | 0 | - | 4.31 | 50,902 |
| Geography by Picture - G | 0 | - | 4.38 | 47,873 |
| Geography by Picture - J | 0 | - | 4.16 | 38,390 |
| Geography by Picture - K | 0 | - | 4.29 | 33,064 |
| Geography by Picture - C | 0 | - | 4.31 | 56,996 |
| Geography by Picture - L | 0 | - | 4.37 | 58,853 |
| Geography by Picture - M | 0 | - | 4.14 | 40,392 |
| Geography by Picture - P | 0 | - | 4.24 | 42,364 |
| Geography by Picture - S | 0 | - | 4.38 | 46,979 |
| Miscellaneous Flags Quiz | 0 | - | 4.42 | 279,419 |
| Country Flags Multiple Choice | 0 | - | 4.97 | 144,031 |
| Flag Maths | 0 | - | 4.64 | 57,715 |
| Satellite Images #1 | 0 | - | 4.46 | 129,196 |
| Satellite Images Quiz #2 | 0 | - | 4.63 | 109,154 |
| Satellite Images Quiz #4 | 0 | - | 4.55 | 88,789 |
| Satellite Images Quiz #5 | 0 | - | 4.52 | 49,795 |
| Satellite Images Quiz #6 | 0 | - | 4.50 | 38,891 |
| Cities by Picture #1 | 0 | - | 4.73 | 85,676 |
| Soccer Team Logos | 0 | - | 4.26 | 372,680 |
| Brand Logos Quiz #1 | 0 | - | 4.82 | 2,412,244 |
| Ultimate Car Logos Quiz | 0 | - | 4.80 | 178,328 |
| Car Logos Quiz #2 | 0 | - | 4.43 | 260,650 |
| Video Game Logos Quiz | 0 | - | 4.40 | 183,334 |
| Movie Logos | 0 | - | 4.33 | 237,185 |
| Brand Logos That Start With M | 0 | - | 4.45 | 62,260 |
| Brand Logos That Start with A | 0 | - | 4.52 | 69,810 |
| Pictures by Letter - E | 0 | - | 3.49 | 34,383 |
| Pictures by Letter - G | 0 | - | 4.14 | 28,038 |
| Pictures by Letter - L | 0 | - | 4.14 | 30,450 |
| Pictures by Letter - F | 0 | - | 4.17 | 28,931 |
| Pictures by Letter - Z | 0 | - | 4.05 | 23,377 |
| Pictures by Letter - Y | 0 | - | 4.22 | 26,201 |
| Pictures by Letter - R | 0 | - | 4.05 | 24,679 |
| Pictures by Letter - K | 0 | - | 4.18 | 25,027 |
| Pictures by Letter - I | 0 | - | 4.16 | 30,295 |
| Pictures by Letter - N | 0 | - | 4.11 | 24,415 |
| Pictures by Letter - P | 0 | - | 4.05 | 25,957 |
| Pictures by Letter - U | 0 | - | 4.10 | 20,713 |
| Pictures by Letter - T | 0 | - | 4.34 | 27,591 |
| History by Picture - A | 0 | - | 4.25 | 45,655 |
| History by Picture - B | 0 | - | 4.40 | 48,806 |
| History by Picture - C | 0 | - | 4.36 | 54,317 |
| History by Picture - F | 0 | - | 4.35 | 37,769 |
| History by Picture - G | 0 | - | 4.40 | 42,025 |
| History by Picture - D | 0 | - | 4.29 | 44,192 |
| History by Picture - E | 0 | - | 4.27 | 43,805 |
| History by Picture - H | 0 | - | 4.37 | 36,691 |
| History by Picture - K | 0 | - | 4.35 | 33,254 |
| History by Picture - M | 0 | - | 4.17 | 36,055 |
| History by Picture - N | 0 | - | 4.40 | 41,149 |
| History by Picture - O | 0 | - | 4.39 | 36,204 |
| History by Picture - T | 0 | - | 4.20 | 33,227 |
| Name that Nut, Seed, or Bean | 0 | - | 4.63 | 57,062 |
| Animals - Taxonomy to Common Name | 0 | - | 4.80 | 28,197 |
| Countries with the Most HIV | 0 | - | 4.46 | 44,390 |
| Countries with the Most Malaria Deaths | 0 | - | 4.45 | 45,090 |
| Art Works Picture Quiz #1 | 0 | - | 4.51 | 118,775 |
| Art Works Picture Quiz #2 | 0 | - | 4.49 | 105,011 |
| Musical Instruments by Picture #1 | 0 | - | 4.52 | 268,445 |
| Flowers by Picture | 0 | - | 4.46 | 105,144 |
| Art Works Picture Quiz #3 | 0 | - | 4.45 | 48,636 |
| Authors by Picture | 0 | - | 4.48 | 25,476 |
| Fruit and Vegetable Emojis | 0 | - | 4.42 | 79,870 |
| WWII Figures by Picture | 0 | - | 4.89 | 64,284 |
| College Sports Logos Quiz #3 | 0 | - | 4.30 | 55,438 |
| Songs by Picture Quiz #1 | 0 | - | 4.68 | 65,678 |
| Songs by Picture Quiz #2 | 0 | - | 4.42 | 58,663 |
| Fish by Picture #1 | 0 | - | 4.41 | 108,318 |
| Animals A-Z by Picture | 0 | - | 4.08 | 66,182 |
| Mammals by Picture #3 | 0 | - | 4.39 | 61,952 |
| Mammals by Picture #4 | 0 | - | 4.03 | 34,032 |
| Birds by Picture #1 | 0 | - | 4.47 | 41,390 |
| Mammals by Picture #2 | 0 | - | 4.28 | 58,065 |
| Oscar Nominated Actors by Picture #1 | 0 | - | 4.42 | 164,905 |
| 1960s Celebrities by Picture #1 | 0 | - | 4.27 | 70,230 |
| 1960s Celebrities by Picture #2 | 0 | - | 4.26 | 51,278 |
| 1950s Celebrities by Picture #1 | 0 | - | 4.24 | 51,048 |
| 1980s Celebrities by Picture #2 | 0 | - | 4.19 | 71,489 |
| 1990s Celebrities by Picture #1 | 0 | - | 4.13 | 79,206 |
| 1990s Celebrities by Picture #2 | 0 | - | 4.16 | 72,167 |
| 2000s Celebrities by Picture #2 | 0 | - | 4.15 | 94,949 |
| 1950s Celebrities by Picture #2 | 0 | - | 4.29 | 46,038 |
| Name that Historical Figure #3 | 0 | - | 4.36 | 238,685 |
| Name that Historical Figure #4 | 0 | - | 4.29 | 158,646 |
| Name that Historical Figure #6 | 0 | - | 4.26 | 92,932 |
| Musicians by Picture #1 | 0 | - | 4.39 | 107,959 |
| Musicians by Picture #2 | 0 | - | 4.29 | 75,861 |
| Musicians by Picture #4 | 0 | - | 4.07 | 64,477 |
| Musicians by Picture #3 | 0 | - | 4.10 | 58,653 |
| Emoji Flags | 0 | - | 4.35 | 43,942 |
| Fill the Map of Europe by Guessing Flag Colors | 0 | - | 4.67 | 37,668 |
| Languages by Combined Flags | 0 | - | 4.53 | 99,574 |
| Satellite Images Quiz #3 | 0 | - | 4.35 | 73,324 |
| Satellite Images - Island Chains | 0 | - | 4.43 | 66,090 |
| Islands by Satellite Image #1 | 0 | - | 4.70 | 70,407 |
| Peninsulas by Satellite Image | 0 | - | 4.53 | 27,733 |
| Landmarks Picture Quiz #1 | 0 | - | 4.16 | 393,780 |
| Airline Logos | 0 | - | 4.45 | 140,325 |
| Fast Food Logos Quiz | 0 | - | 4.44 | 247,632 |
| Mostly-American Candy Logos | 0 | - | 4.14 | 158,422 |
| Brand Logos That Start With S | 0 | - | 4.37 | 57,177 |
| Brand Logos That Start With B | 0 | - | 4.38 | 59,636 |
| Brand Logos That Start With D | 0 | - | 4.37 | 61,137 |
| Brand Logos That Start With L | 0 | - | 4.39 | 60,690 |
| Brand Logos That Start With C | 0 | - | 4.17 | 49,353 |
| Vegetables by Picture | 0 | - | 4.39 | 63,120 |
| Pick a Picture - Musical Instruments | 0 | - | 4.53 | 52,105 |
| Elements Named for Countries | 0 | - | 4.52 | 24,561 |
| Albert Einstein Trivia | 0 | - | 4.58 | 18,344 |
| Animal Anatomy Quiz | 0 | - | 4.39 | 59,743 |
