| Metals of Antiquity | 0 | - | 4.94 | 93,093 |
| Elements by Picture | 0 | - | 4.28 | 69,703 |
| Animals by Skeleton Image | 0 | - | 4.80 | 46,152 |
| Rocks and Minerals Picture Quiz | 0 | - | 4.48 | 29,223 |
| Former Countries by Territory Map | 0 | - | 4.96 | 102,035 |
| Empires by Maps | 0 | - | 4.98 | 119,157 |
| Planets By Picture Quiz | 0 | - | 4.49 | 56,416 |
| Flag Vocabulary Mega-Challenge | 0 | - | 4.34 | 27,037 |
| Merged Company Logos #1 | 0 | - | 4.91 | 105,765 |
| All Country Flags of the World | 0 | - | 5.00 | 3,624,257 |
| Elements Named for Countries | 0 | - | 4.52 | 24,524 |
| Words for Leaders | 0 | - | 4.77 | 255,850 |
| German Loan Words | 0 | - | 4.27 | 135,586 |
| Islands by Shape #2 | 0 | - | 4.88 | 59,090 |
| Visual Memory Test - Random Cartoons | 0 | - | 4.98 | 103,281 |
| Play-Doh People from History | 0 | - | 4.99 | 94,209 |
| Famous Landmarks Out Of Focus #1 | 0 | - | 4.89 | 60,568 |
| Circular Cutouts from a World Map | 0 | - | 4.98 | 61,216 |
| Country Flags Quiz #1 | 0 | - | 4.98 | 2,530,331 |
| Country Flags Quiz #2 | 0 | - | 4.98 | 1,089,295 |
| Country Flags Quiz #3 | 0 | - | 4.98 | 731,025 |
| Make a Stained Glass Window | 0 | - | 5.00 | 68,070 |
| Flags with Crescents | 0 | - | 4.98 | 168,238 |
| Country Flag Trivia | 0 | - | 4.81 | 56,268 |
| Country Flags with Eagles - Picture Quiz | 0 | - | 4.98 | 102,838 |
| Country Flags with the Union Jack | 0 | - | 4.87 | 76,789 |
| Pixelated Flag Quiz | 0 | - | 4.98 | 86,382 |
| Flag Emblems Scavenger Hunt | 0 | - | 5.00 | 66,743 |
| Flags by Horizontal Stripes #1 | 0 | - | 4.84 | 84,642 |
| Country Flags with the Sun - Picture Quiz | 0 | - | 4.83 | 52,316 |
| Real vs. Fake Flags | 0 | - | 4.98 | 123,117 |
| National Football Team Logos | 0 | - | 4.85 | 179,378 |
| Countries with the Highest Carbon Dioxide Emissions | 0 | - | 4.97 | 109,592 |
| Years in History by Picture | 0 | - | 4.44 | 35,274 |
| Famous Foreheads #1 | 0 | - | 4.47 | 74,472 |
| Flags to Languages | 0 | - | 4.95 | 172,914 |
| Merged Company Logos #2 | 0 | - | 4.75 | 77,035 |
| Similar Country Flags - Multiple Choice Quiz | 0 | - | 4.94 | 50,182 |
| The Voyage of Darwin - Animated Map Quiz | 0 | - | 4.99 | 14,403 |
| Countries Reducing Carbon Dioxide Emissions the Most | 0 | - | 4.89 | 64,376 |
| Countries with the Most Forest | 0 | - | 4.87 | 146,830 |
| Countries with Glaciers | 0 | - | 4.97 | 104,815 |
| Three Real and One Fake - Country Flags | 0 | - | 4.97 | 83,550 |
| Fruits by Picture | 0 | - | 4.20 | 805,625 |
| Old Movies by Picture | 0 | - | 4.51 | 24,931 |
| Musical Instruments by Picture #2 | 0 | - | 4.24 | 46,804 |
| 1980s Movie Silhouettes | 0 | - | 4.97 | 103,131 |
| Pick a Picture - Animal Relations | 0 | - | 4.94 | 55,053 |
| Name that Historical Figure #1 | 0 | - | 4.63 | 336,323 |
| Geography by Picture - B | 0 | - | 4.42 | 55,486 |
| Geography by Picture - H | 0 | - | 4.50 | 58,101 |
| Geography by Picture - N | 0 | - | 4.45 | 42,097 |
| Geography by Picture - R | 0 | - | 4.56 | 40,925 |
| Geography by Picture - T | 0 | - | 4.54 | 57,738 |
| Country Flags Multiple Choice | 0 | - | 4.97 | 143,881 |
| Name the Pixelated Landmark | 0 | - | 4.84 | 62,662 |
| Car Logos Quiz #1 | 0 | - | 4.44 | 534,902 |
| Random Logos Quiz | 0 | - | 4.31 | 207,524 |
| All North American Pro Sports Logos | 0 | - | 4.70 | 113,968 |
| Brand Logos Quiz #1 | 0 | - | 4.83 | 2,409,746 |
| Pictures by Letter - A | 0 | - | 4.17 | 33,235 |
| Pictures by Letter - J | 0 | - | 4.31 | 39,839 |
| Pictures by Letter - B | 0 | - | 4.31 | 43,723 |
| Pictures by Letter - D | 0 | - | 4.16 | 37,413 |
| Pictures by Letter - M | 0 | - | 4.24 | 37,632 |
| Body Parts in History and Culture | 0 | - | 4.42 | 35,191 |
| Name the Constellations - With a Map | 0 | - | 4.92 | 35,757 |
| NCAA Football Team Name Vocabulary | 0 | - | 4.23 | 20,312 |
| Military History Vocabulary | 0 | - | 4.91 | 66,818 |
| Name that Bug | 0 | - | 4.12 | 45,492 |
| Islands by Shape #1 | 0 | - | 4.32 | 84,236 |
| 1970s Celebrities by Picture #1 | 0 | - | 4.20 | 57,738 |
| 1970s Celebrities by Picture #2 | 0 | - | 4.21 | 50,505 |
| Islands by Picture | 0 | - | 4.29 | 106,290 |
| Name that Object #1 | 0 | - | 3.56 | 96,349 |
| Classic Movies by Movie Posters | 0 | - | 4.45 | 24,145 |
| WWII Figures by Picture | 0 | - | 4.89 | 62,058 |
| Famous Landmarks Out Of Focus #2 | 0 | - | 4.37 | 40,975 |
| Animals by Close-up Image | 0 | - | 4.42 | 217,256 |
| Aquatic Mammals by Picture | 0 | - | 4.41 | 45,402 |
| Extinct Animals by Picture | 0 | - | 4.49 | 35,038 |
| Mammals by Picture #1 | 0 | - | 4.70 | 91,378 |
| 1940s Celebrities by Picture | 0 | - | 4.43 | 47,857 |
| International Footballers by Picture | 0 | - | 4.50 | 55,079 |
| Name that Historical Figure #2 | 0 | - | 4.41 | 283,465 |
| Name that Historical Figure #5 | 0 | - | 4.43 | 107,064 |
| Name that Historical Figure #7 - U.S. Edition | 0 | - | 4.50 | 50,531 |
| Geography by Picture - A | 0 | - | 4.39 | 60,115 |
| Geography by Picture - D | 0 | - | 4.15 | 45,550 |
| Geography by Picture - F | 0 | - | 4.31 | 50,883 |
| Geography by Picture - G | 0 | - | 4.38 | 47,854 |
| Geography by Picture - J | 0 | - | 4.16 | 38,374 |
| Geography by Picture - K | 0 | - | 4.29 | 33,049 |
| Geography by Picture - C | 0 | - | 4.31 | 56,980 |
| Geography by Picture - L | 0 | - | 4.37 | 58,832 |
| Geography by Picture - M | 0 | - | 4.14 | 40,374 |
| Geography by Picture - P | 0 | - | 4.24 | 42,343 |
| Geography by Picture - S | 0 | - | 4.38 | 46,958 |
| Miscellaneous Flags Quiz | 0 | - | 4.42 | 279,153 |
| Flag Coloring Book Puzzle #1 | 0 | - | 4.97 | 170,442 |
| Flag Maths | 0 | - | 4.63 | 57,699 |
| Satellite Images #1 | 0 | - | 4.46 | 129,147 |
| Satellite Images Quiz #2 | 0 | - | 4.63 | 109,108 |
| Satellite Images Quiz #4 | 0 | - | 4.55 | 88,753 |
| Satellite Images Quiz #5 | 0 | - | 4.52 | 49,747 |
| Satellite Images Quiz #6 | 0 | - | 4.50 | 38,871 |
| Cities by Picture #1 | 0 | - | 4.73 | 85,590 |
| Soccer Team Logos | 0 | - | 4.26 | 372,257 |
| Ultimate Car Logos Quiz | 0 | - | 4.80 | 177,781 |
| Car Logos Quiz #2 | 0 | - | 4.43 | 260,340 |
| Video Game Logos Quiz | 0 | - | 4.40 | 183,164 |
| Movie Logos | 0 | - | 4.33 | 236,829 |
| Brand Logos That Start With M | 0 | - | 4.45 | 62,148 |
| Brand Logos That Start with A | 0 | - | 4.51 | 69,678 |
| History by Picture - A | 0 | - | 4.25 | 45,614 |
| History by Picture - B | 0 | - | 4.40 | 48,747 |
| History by Picture - C | 0 | - | 4.36 | 54,257 |
| History by Picture - F | 0 | - | 4.35 | 37,726 |
| History by Picture - G | 0 | - | 4.40 | 41,985 |
| History by Picture - D | 0 | - | 4.29 | 44,145 |
| History by Picture - E | 0 | - | 4.27 | 43,767 |
| History by Picture - H | 0 | - | 4.37 | 36,658 |
| History by Picture - K | 0 | - | 4.35 | 33,220 |
| History by Picture - M | 0 | - | 4.17 | 36,017 |
| History by Picture - N | 0 | - | 4.40 | 41,108 |
| History by Picture - O | 0 | - | 4.39 | 36,161 |
| History by Picture - T | 0 | - | 4.20 | 33,195 |
| Name that Nut, Seed, or Bean | 0 | - | 4.63 | 57,002 |
| Animals - Taxonomy to Common Name | 0 | - | 4.80 | 28,170 |
| Countries with the Most HIV | 0 | - | 4.46 | 44,374 |
| Countries with the Most Malaria Deaths | 0 | - | 4.45 | 45,041 |
| Countries that Desalinate the Most Water | 0 | - | 4.77 | 41,452 |
| Art Works Picture Quiz #1 | 0 | - | 4.51 | 118,696 |
| Art Works Picture Quiz #2 | 0 | - | 4.49 | 104,936 |
| Musical Instruments by Picture #1 | 0 | - | 4.52 | 268,314 |
| Foods by Picture | 0 | - | 3.81 | 225,711 |
| Flowers by Picture | 0 | - | 4.46 | 105,110 |
| Junk Foods by Picture | 0 | - | 3.69 | 96,145 |
| Art Works Picture Quiz #3 | 0 | - | 4.45 | 48,611 |
| Christmas by Picture | 0 | - | 4.25 | 28,123 |
| Name that Object #2 | 0 | - | 3.64 | 15,356 |
| Hats by Picture | 0 | - | 4.21 | 17,921 |
| Weapons by Picture | 0 | - | 4.13 | 20,958 |
| Cars by Picture | 0 | - | 3.89 | 41,233 |
| Reptile Picture Quiz | 0 | - | 4.32 | 14,253 |
| Authors by Picture | 0 | - | 4.48 | 25,450 |
| Plants by Picture | 0 | - | 4.24 | 14,381 |
| Name that Object #3 | 0 | - | 3.93 | 14,326 |
| Fruit and Vegetable Emojis | 0 | - | 4.42 | 79,770 |
| College Sports Logos Quiz #3 | 0 | - | 4.30 | 55,362 |
| Songs by Picture Quiz #1 | 0 | - | 4.68 | 65,589 |
| Songs by Picture Quiz #2 | 0 | - | 4.42 | 58,601 |
| Fish by Picture #1 | 0 | - | 4.41 | 108,271 |
| Animals A-Z by Picture | 0 | - | 4.08 | 66,115 |
| Mammals by Picture #3 | 0 | - | 4.39 | 61,902 |
| Mammals by Picture #4 | 0 | - | 4.03 | 34,005 |
| Birds by Picture #1 | 0 | - | 4.47 | 41,330 |
| Mammals by Picture #2 | 0 | - | 4.28 | 58,022 |
| Oscar Nominated Actors by Picture #1 | 0 | - | 4.42 | 164,707 |
| 1960s Celebrities by Picture #1 | 0 | - | 4.27 | 70,161 |
| 1960s Celebrities by Picture #2 | 0 | - | 4.26 | 51,237 |
| 1950s Celebrities by Picture #1 | 0 | - | 4.24 | 51,014 |
| 1980s Celebrities by Picture #2 | 0 | - | 4.19 | 71,421 |
| 1990s Celebrities by Picture #1 | 0 | - | 4.13 | 79,149 |
| 1990s Celebrities by Picture #2 | 0 | - | 4.16 | 72,103 |
| 2000s Celebrities by Picture #2 | 0 | - | 4.15 | 94,846 |
| Women in History by Picture | 0 | - | 4.25 | 25,815 |
| 1950s Celebrities by Picture #2 | 0 | - | 4.29 | 46,004 |
| Name that Historical Figure #3 | 0 | - | 4.36 | 238,485 |
| Name that Historical Figure #4 | 0 | - | 4.29 | 158,503 |
| Name that Historical Figure #6 | 0 | - | 4.27 | 92,816 |
| Musicians by Picture #1 | 0 | - | 4.39 | 107,752 |
| Musicians by Picture #2 | 0 | - | 4.29 | 75,713 |
| Musicians by Picture #4 | 0 | - | 4.07 | 64,351 |
| Musicians by Picture #3 | 0 | - | 4.10 | 58,565 |
| Geography by Picture - E | 0 | - | 3.55 | 47,310 |
| Landforms by Picture | 0 | - | 4.31 | 20,606 |
| Geography by Picture - I | 0 | - | 4.00 | 39,346 |
| Emoji Flags | 0 | - | 4.35 | 43,903 |
| Fill the Map of Europe by Guessing Flag Colors | 0 | - | 4.64 | 37,614 |
| Languages by Combined Flags | 0 | - | 4.53 | 99,470 |
| Satellite Images Quiz #3 | 0 | - | 4.35 | 73,300 |
| Satellite Images - Island Chains | 0 | - | 4.43 | 65,982 |
| Islands by Satellite Image #1 | 0 | - | 4.70 | 70,341 |
| Peninsulas by Satellite Image | 0 | - | 4.53 | 27,715 |
| Landmarks Picture Quiz #1 | 0 | - | 4.16 | 393,557 |
| Airline Logos | 0 | - | 4.45 | 140,219 |
| Brand Logos Quiz #2 | 0 | - | 4.69 | 1,683,485 |
| Brand Logos Quiz #4 | 0 | - | 4.45 | 1,008,414 |
| Fast Food Logos Quiz | 0 | - | 4.44 | 247,466 |
| Mostly-American Candy Logos | 0 | - | 4.14 | 158,274 |
| Brand Logos That Start With S | 0 | - | 4.37 | 57,063 |
| Brand Logos That Start With B | 0 | - | 4.38 | 59,535 |
| Brand Logos That Start With D | 0 | - | 4.37 | 61,029 |
| Brand Logos That Start With L | 0 | - | 4.39 | 60,571 |
| Brand Logos That Start With C | 0 | - | 4.17 | 49,261 |
| Pictures by Letter - E | 0 | - | 3.49 | 34,356 |
| Pictures by Letter - G | 0 | - | 4.14 | 28,005 |
| Pictures by Letter - L | 0 | - | 4.14 | 30,413 |
| Pictures by Letter - F | 0 | - | 4.17 | 28,895 |
