| Metals of Antiquity | 0 | - | 4.94 | 93,096 |
| Elements by Picture | 0 | - | 4.28 | 69,709 |
| Animals by Skeleton Image | 0 | - | 4.80 | 46,156 |
| Rocks and Minerals Picture Quiz | 0 | - | 4.48 | 29,224 |
| Former Countries by Territory Map | 0 | - | 4.96 | 102,047 |
| Empires by Maps | 0 | - | 4.98 | 119,185 |
| Planets By Picture Quiz | 0 | - | 4.49 | 56,426 |
| Flag Vocabulary Mega-Challenge | 0 | - | 4.34 | 27,038 |
| Merged Company Logos #1 | 0 | - | 4.91 | 105,774 |
| All Country Flags of the World | 0 | - | 5.00 | 3,624,798 |
| Elements Named for Countries | 0 | - | 4.52 | 24,526 |
| Words for Leaders | 0 | - | 4.77 | 255,869 |
| German Loan Words | 0 | - | 4.27 | 135,587 |
| Islands by Shape #2 | 0 | - | 4.88 | 59,090 |
| Visual Memory Test - Random Cartoons | 0 | - | 4.98 | 103,292 |
| Play-Doh People from History | 0 | - | 4.99 | 94,225 |
| Famous Landmarks Out Of Focus #1 | 0 | - | 4.89 | 60,573 |
| Circular Cutouts from a World Map | 0 | - | 4.98 | 61,222 |
| Country Flags Quiz #1 | 0 | - | 4.98 | 2,530,447 |
| Country Flags Quiz #2 | 0 | - | 4.98 | 1,089,353 |
| Country Flags Quiz #3 | 0 | - | 4.98 | 731,062 |
| Make a Stained Glass Window | 0 | - | 5.00 | 68,073 |
| Flags with Crescents | 0 | - | 4.98 | 168,258 |
| Country Flag Trivia | 0 | - | 4.81 | 56,279 |
| Country Flags with Eagles - Picture Quiz | 0 | - | 4.98 | 102,854 |
| Country Flags with the Union Jack | 0 | - | 4.87 | 76,801 |
| Pixelated Flag Quiz | 0 | - | 4.98 | 86,394 |
| Flag Emblems Scavenger Hunt | 0 | - | 5.00 | 66,754 |
| Flags by Horizontal Stripes #1 | 0 | - | 4.84 | 84,649 |
| Country Flags with the Sun - Picture Quiz | 0 | - | 4.83 | 52,319 |
| Real vs. Fake Flags | 0 | - | 4.98 | 123,136 |
| National Football Team Logos | 0 | - | 4.85 | 179,394 |
| Countries with the Highest Carbon Dioxide Emissions | 0 | - | 4.97 | 109,595 |
| Years in History by Picture | 0 | - | 4.44 | 35,277 |
| Famous Foreheads #1 | 0 | - | 4.47 | 74,475 |
| Flags to Languages | 0 | - | 4.95 | 172,923 |
| Merged Company Logos #2 | 0 | - | 4.75 | 77,038 |
| Similar Country Flags - Multiple Choice Quiz | 0 | - | 4.94 | 50,182 |
| The Voyage of Darwin - Animated Map Quiz | 0 | - | 4.99 | 14,405 |
| Countries Reducing Carbon Dioxide Emissions the Most | 0 | - | 4.89 | 64,379 |
| Countries with the Most Forest | 0 | - | 4.87 | 146,833 |
| Countries with Glaciers | 0 | - | 4.97 | 104,820 |
| Three Real and One Fake - Country Flags | 0 | - | 4.97 | 83,560 |
| Fruits by Picture | 0 | - | 4.20 | 805,649 |
| Old Movies by Picture | 0 | - | 4.51 | 24,934 |
| Musical Instruments by Picture #2 | 0 | - | 4.24 | 46,806 |
| 1980s Movie Silhouettes | 0 | - | 4.97 | 103,143 |
| Pick a Picture - Animal Relations | 0 | - | 4.94 | 55,060 |
| Name that Historical Figure #1 | 0 | - | 4.63 | 336,346 |
| Geography by Picture - B | 0 | - | 4.42 | 55,491 |
| Geography by Picture - H | 0 | - | 4.50 | 58,105 |
| Geography by Picture - N | 0 | - | 4.45 | 42,100 |
| Geography by Picture - R | 0 | - | 4.56 | 40,926 |
| Geography by Picture - T | 0 | - | 4.54 | 57,739 |
| Country Flags Multiple Choice | 0 | - | 4.97 | 143,892 |
| Name the Pixelated Landmark | 0 | - | 4.84 | 62,665 |
| Car Logos Quiz #1 | 0 | - | 4.44 | 534,946 |
| Random Logos Quiz | 0 | - | 4.31 | 207,543 |
| All North American Pro Sports Logos | 0 | - | 4.70 | 113,987 |
| Brand Logos Quiz #1 | 0 | - | 4.83 | 2,409,918 |
| Pictures by Letter - A | 0 | - | 4.17 | 33,238 |
| Pictures by Letter - J | 0 | - | 4.31 | 39,840 |
| Pictures by Letter - B | 0 | - | 4.31 | 43,727 |
| Pictures by Letter - D | 0 | - | 4.16 | 37,415 |
| Pictures by Letter - M | 0 | - | 4.24 | 37,634 |
| Body Parts in History and Culture | 0 | - | 4.42 | 35,192 |
| Name the Constellations - With a Map | 0 | - | 4.92 | 35,762 |
| NCAA Football Team Name Vocabulary | 0 | - | 4.23 | 20,314 |
| Military History Vocabulary | 0 | - | 4.91 | 66,822 |
| Name that Bug | 0 | - | 4.12 | 45,492 |
| Islands by Shape #1 | 0 | - | 4.32 | 84,238 |
| 1970s Celebrities by Picture #1 | 0 | - | 4.20 | 57,740 |
| 1970s Celebrities by Picture #2 | 0 | - | 4.21 | 50,508 |
| Islands by Picture | 0 | - | 4.29 | 106,304 |
| Name that Object #1 | 0 | - | 3.56 | 96,350 |
| Classic Movies by Movie Posters | 0 | - | 4.45 | 24,147 |
| WWII Figures by Picture | 0 | - | 4.89 | 62,445 |
| Famous Landmarks Out Of Focus #2 | 0 | - | 4.37 | 40,982 |
| Animals by Close-up Image | 0 | - | 4.42 | 217,267 |
| Aquatic Mammals by Picture | 0 | - | 4.41 | 45,406 |
| Extinct Animals by Picture | 0 | - | 4.49 | 35,040 |
| Mammals by Picture #1 | 0 | - | 4.70 | 91,381 |
| 1940s Celebrities by Picture | 0 | - | 4.43 | 47,859 |
| International Footballers by Picture | 0 | - | 4.50 | 55,086 |
| Name that Historical Figure #2 | 0 | - | 4.41 | 283,486 |
| Name that Historical Figure #5 | 0 | - | 4.43 | 107,073 |
| Name that Historical Figure #7 - U.S. Edition | 0 | - | 4.50 | 50,534 |
| Geography by Picture - A | 0 | - | 4.39 | 60,118 |
| Geography by Picture - D | 0 | - | 4.15 | 45,552 |
| Geography by Picture - F | 0 | - | 4.31 | 50,885 |
| Geography by Picture - G | 0 | - | 4.38 | 47,855 |
| Geography by Picture - J | 0 | - | 4.16 | 38,376 |
| Geography by Picture - K | 0 | - | 4.29 | 33,050 |
| Geography by Picture - C | 0 | - | 4.31 | 56,982 |
| Geography by Picture - L | 0 | - | 4.37 | 58,835 |
| Geography by Picture - M | 0 | - | 4.14 | 40,376 |
| Geography by Picture - P | 0 | - | 4.24 | 42,345 |
| Geography by Picture - S | 0 | - | 4.38 | 46,959 |
| Miscellaneous Flags Quiz | 0 | - | 4.42 | 279,175 |
| Flag Coloring Book Puzzle #1 | 0 | - | 4.97 | 170,460 |
| Flag Maths | 0 | - | 4.63 | 57,700 |
| Satellite Images #1 | 0 | - | 4.46 | 129,154 |
| Satellite Images Quiz #2 | 0 | - | 4.63 | 109,112 |
| Satellite Images Quiz #4 | 0 | - | 4.55 | 88,757 |
| Satellite Images Quiz #5 | 0 | - | 4.52 | 49,753 |
| Satellite Images Quiz #6 | 0 | - | 4.50 | 38,875 |
| Cities by Picture #1 | 0 | - | 4.73 | 85,595 |
| Soccer Team Logos | 0 | - | 4.26 | 372,301 |
| Ultimate Car Logos Quiz | 0 | - | 4.80 | 177,809 |
| Car Logos Quiz #2 | 0 | - | 4.43 | 260,364 |
| Video Game Logos Quiz | 0 | - | 4.40 | 183,172 |
| Movie Logos | 0 | - | 4.33 | 236,859 |
| Brand Logos That Start With M | 0 | - | 4.45 | 62,157 |
| Brand Logos That Start with A | 0 | - | 4.51 | 69,692 |
| History by Picture - A | 0 | - | 4.25 | 45,618 |
| History by Picture - B | 0 | - | 4.40 | 48,750 |
| History by Picture - C | 0 | - | 4.36 | 54,262 |
| History by Picture - F | 0 | - | 4.35 | 37,730 |
| History by Picture - G | 0 | - | 4.40 | 41,990 |
| History by Picture - D | 0 | - | 4.29 | 44,150 |
| History by Picture - E | 0 | - | 4.27 | 43,770 |
| History by Picture - H | 0 | - | 4.37 | 36,664 |
| History by Picture - K | 0 | - | 4.35 | 33,223 |
| History by Picture - M | 0 | - | 4.17 | 36,020 |
| History by Picture - N | 0 | - | 4.40 | 41,112 |
| History by Picture - O | 0 | - | 4.39 | 36,172 |
| History by Picture - T | 0 | - | 4.20 | 33,197 |
| Name that Nut, Seed, or Bean | 0 | - | 4.63 | 57,004 |
| Animals - Taxonomy to Common Name | 0 | - | 4.80 | 28,174 |
| Countries with the Most HIV | 0 | - | 4.46 | 44,374 |
| Countries with the Most Malaria Deaths | 0 | - | 4.45 | 45,045 |
| Countries that Desalinate the Most Water | 0 | - | 4.77 | 41,453 |
| Art Works Picture Quiz #1 | 0 | - | 4.51 | 118,702 |
| Art Works Picture Quiz #2 | 0 | - | 4.49 | 104,940 |
| Musical Instruments by Picture #1 | 0 | - | 4.52 | 268,327 |
| Foods by Picture | 0 | - | 3.81 | 225,718 |
| Flowers by Picture | 0 | - | 4.46 | 105,111 |
| Junk Foods by Picture | 0 | - | 3.69 | 96,151 |
| Art Works Picture Quiz #3 | 0 | - | 4.45 | 48,612 |
| Christmas by Picture | 0 | - | 4.25 | 28,123 |
| Name that Object #2 | 0 | - | 3.64 | 15,357 |
| Hats by Picture | 0 | - | 4.21 | 17,921 |
| Weapons by Picture | 0 | - | 4.13 | 20,960 |
| Cars by Picture | 0 | - | 3.89 | 41,238 |
| Reptile Picture Quiz | 0 | - | 4.32 | 14,253 |
| Authors by Picture | 0 | - | 4.48 | 25,452 |
| Plants by Picture | 0 | - | 4.24 | 14,382 |
| Name that Object #3 | 0 | - | 3.93 | 14,329 |
| Fruit and Vegetable Emojis | 0 | - | 4.42 | 79,784 |
| College Sports Logos Quiz #3 | 0 | - | 4.30 | 55,375 |
| Songs by Picture Quiz #1 | 0 | - | 4.68 | 65,596 |
| Songs by Picture Quiz #2 | 0 | - | 4.42 | 58,606 |
| Fish by Picture #1 | 0 | - | 4.41 | 108,273 |
| Animals A-Z by Picture | 0 | - | 4.08 | 66,122 |
| Mammals by Picture #3 | 0 | - | 4.39 | 61,904 |
| Mammals by Picture #4 | 0 | - | 4.03 | 34,008 |
| Birds by Picture #1 | 0 | - | 4.47 | 41,334 |
| Mammals by Picture #2 | 0 | - | 4.28 | 58,027 |
| Oscar Nominated Actors by Picture #1 | 0 | - | 4.42 | 164,736 |
| 1960s Celebrities by Picture #1 | 0 | - | 4.27 | 70,166 |
| 1960s Celebrities by Picture #2 | 0 | - | 4.26 | 51,240 |
| 1950s Celebrities by Picture #1 | 0 | - | 4.24 | 51,015 |
| 1980s Celebrities by Picture #2 | 0 | - | 4.19 | 71,426 |
| 1990s Celebrities by Picture #1 | 0 | - | 4.13 | 79,153 |
| 1990s Celebrities by Picture #2 | 0 | - | 4.16 | 72,104 |
| 2000s Celebrities by Picture #2 | 0 | - | 4.15 | 94,850 |
| Women in History by Picture | 0 | - | 4.25 | 25,815 |
| 1950s Celebrities by Picture #2 | 0 | - | 4.29 | 46,005 |
| Name that Historical Figure #3 | 0 | - | 4.36 | 238,501 |
| Name that Historical Figure #4 | 0 | - | 4.29 | 158,516 |
| Name that Historical Figure #6 | 0 | - | 4.27 | 92,826 |
| Musicians by Picture #1 | 0 | - | 4.39 | 107,764 |
| Musicians by Picture #2 | 0 | - | 4.29 | 75,720 |
| Musicians by Picture #4 | 0 | - | 4.07 | 64,358 |
| Musicians by Picture #3 | 0 | - | 4.10 | 58,569 |
| Geography by Picture - E | 0 | - | 3.55 | 47,313 |
| Landforms by Picture | 0 | - | 4.31 | 20,608 |
| Geography by Picture - I | 0 | - | 4.00 | 39,347 |
| Emoji Flags | 0 | - | 4.35 | 43,905 |
| Fill the Map of Europe by Guessing Flag Colors | 0 | - | 4.64 | 37,621 |
| Languages by Combined Flags | 0 | - | 4.53 | 99,475 |
| Satellite Images Quiz #3 | 0 | - | 4.35 | 73,303 |
| Satellite Images - Island Chains | 0 | - | 4.43 | 65,988 |
| Islands by Satellite Image #1 | 0 | - | 4.70 | 70,348 |
| Peninsulas by Satellite Image | 0 | - | 4.53 | 27,716 |
| Landmarks Picture Quiz #1 | 0 | - | 4.16 | 393,567 |
| Airline Logos | 0 | - | 4.45 | 140,225 |
| Brand Logos Quiz #2 | 0 | - | 4.69 | 1,683,586 |
| Brand Logos Quiz #4 | 0 | - | 4.45 | 1,008,480 |
| Fast Food Logos Quiz | 0 | - | 4.44 | 247,482 |
| Mostly-American Candy Logos | 0 | - | 4.14 | 158,292 |
| Brand Logos That Start With S | 0 | - | 4.37 | 57,079 |
| Brand Logos That Start With B | 0 | - | 4.38 | 59,544 |
| Brand Logos That Start With D | 0 | - | 4.37 | 61,043 |
| Brand Logos That Start With L | 0 | - | 4.39 | 60,579 |
| Brand Logos That Start With C | 0 | - | 4.17 | 49,266 |
| Pictures by Letter - E | 0 | - | 3.49 | 34,357 |
| Pictures by Letter - G | 0 | - | 4.14 | 28,007 |
| Pictures by Letter - L | 0 | - | 4.14 | 30,414 |
| Pictures by Letter - F | 0 | - | 4.17 | 28,897 |
