| Human Biology Multiple Choice Quiz #2 | 17,043 | - | - |
| Human Biology Multiple Choice Quiz #1 | 11,586 | - | - |
| Human Biology Multiple Choice Quiz #3 | 5,376 | - | - |
| Largest Types of Birds | 26,883 | 0 | - |
| Mythical Creatures Quiz #1 | 703,922 | 0 | - |
| Animal Adjectives | 59,803 | 0 | - |
| Animal Anatomy Quiz | 59,610 | 0 | - |
| Snake Knowledge | 18,716 | 0 | - |
| Medical Acronyms | 95,715 | 0 | - |
| Säugetiere nach Bildern #1 | 13,676 | 0 | - |
| Family Vocabulary - Decipher the Relationships | 163 | - | - |
| Countries with the Most Species | 95,180 | 0 | - |
| Flowers by Picture | 104,975 | 0 | - |
| Animals that Start with F | 106,458 | 0 | - |
| Fish by Picture #1 | 108,025 | 0 | - |
| Bird Knowledge #1 | 15,675 | 0 | - |
| Animal Ranges - Do They Live There? | 43,634 | 0 | - |
| Countries with the Most Wolves | 106,943 | 0 | - |
| Top 10 Countries with the Most Horses | 68,623 | 0 | - |
| Top 15 Countries with the Most Cows | 92,754 | 0 | - |
| Groups of Two - Science | 48,116 | 0 | - |
| Animal Varieties #2 | 66,373 | 0 | - |
| Name Every Fruit | 1,480 | - | - |
| Animals of Australia | 42,134 | 0 | - |
| Elements that are Gases at Room Temperature | 63,932 | 0 | - |
| PSE Quiz | 338,275 | 0 | - |
| Word Scramble - Random Animals | 48,861 | 0 | - |
| Birds - Sudden Death | 66,567 | 0 | - |
| Biology General Knowledge #1 | 1,350 | - | - |
| Bird Knowledge #2 | 14,088 | 0 | - |
| Dinosaur Picture Quiz | 1,142 | - | - |
| Scientific Animal Names | 650 | - | - |
| Mammals - Sudden Death | 83,871 | 0 | - |
| Click on the Fish (Sudden Death) | 4,455 | - | - |
| Insects - Sudden Death | 11,064 | - | - |
| Dog Breeds - Sudden Death | 74,786 | 0 | - |
| Countries With The Most Dogs | 960 | - | - |
| Animals - Sudden Death | 4,407 | - | - |
| UK Birds | 225 | - | - |
| Birds by Picture #1 | 41,035 | 0 | - |
| All Valid Dinosaur Genera | 3,458 | - | - |
| Marketing Slogans for Animals | 29,105 | 0 | - |
| Animal Look-Alikes #2 | 2,190 | - | - |
| Alpacas or Llamas | 247 | - | - |
| Math symbols and functions quiz | 1,848 | - | - |
| Geologic Eons, Eras and Periods | 2,742 | - | - |
| Celsius, Fahrenheit or Kelvin? | 645 | - | - |
| Mammals by Picture #3 | 61,714 | 0 | - |
| Anatomy of the Ankle and Foot on a Click Map | 1,124 | - | - |
| Birds by Picture #2 | 35,898 | 0 | - |
| Lebensräume von Tieren - leben sie dort? | 14,052 | 0 | - |
| All bones of the human skull (side view) | 1,906 | - | - |
| Countries With the Most Biodiversity - Sudden Death | 1,647 | - | - |
| Where Does It Grow? Click Quiz #1 | 57,549 | 0 | - |
| Bärenarten | 10,769 | 0 | - |
| Animal Tracks | 290 | - | - |
| Click the Animals - German | 1,077 | - | - |
| Reptiles - Sudden Death | 8,438 | - | - |
| Marine Animals - Sudden Death | 7,249 | - | - |
| Common Names for B Group Vitamins | 289 | - | - |
| Birds by Picture #3 | 32,795 | 0 | - |
| Man Outruns Slow Animals - Sudden Death | 92,432 | 0 | - |
| Australian Animals - Sudden Death | 77,223 | 0 | - |
| Animal Look-Alikes #1 | 3,321 | - | - |
| Native Animals of New Zealand by Picture | 266 | - | - |
| Confusing Animal Names - Picture Quiz | 3,692 | - | - |
| Baby, Male and Female Animals | 149,527 | 0 | - |
| Zufälliges Symbol zum Element | 4,319 | 0 | - |
| Vertebrates - Sudden Death | 2,918 | - | - |
| Liquids - Sudden Death! | 3,071 | - | - |
| Kopf-an-Kopf - Tiere | 22,607 | 0 | - |
| Flying Animals - Sudden Death | 6,939 | - | - |
| Countries with Wild Pangolins | 1,159 | - | - |
| Monkeys and Apes - Picture Click Quiz | 3,332 | - | - |
| Klicken Sie auf das chemische Element | 19,281 | 0 | - |
| Fish - Sudden Death | 15,240 | - | - |
| Dog Breed Picture Quiz | 205,420 | 0 | - |
| Parts of a leaf - Map Quiz | 394 | - | - |
| Animals by Range on a World Map | 25,143 | 0 | - |
| Name Every North American Bird | 1,929 | - | - |
| Säugetiere A-Z - Bilderquiz | 13,831 | 0 | - |
| Random Atomic Number to Element | 1,093 | - | - |
| Cultivars of Brassica oleracea | 433 | - | - |
| Chemische Elemente mit höchstens 4 Buchstaben | 6,480 | 0 | - |
| Objects in space - sudden death | 1,983 | - | - |
| Most Common Elements in the Human Body | 150,208 | 0 | - |
| Bones of the Human Body | 21,524 | 0 | - |
| Klicken Sie auf den Planeten | 15,222 | 0 | - |
| Bäume anhand ihrer Blätter - Bildquiz | 4,697 | 0 | - |
| Animal Group Names | 23,092 | 0 | - |
| Body Parts - Sudden Death #1 | 60,388 | 0 | - |
| Bovid Species | 400 | - | - |
| Most Common Animal Words | 37,368 | 0 | - |
| Heimische Vögel Bildquiz #1 | 3,245 | 0 | - |
| Random Sequential Elements on the Periodic Table | 4,405 | - | - |
| Egg Laying Animals - Sudden Death | 5,134 | - | - |
| Körperteile mit nur einer Silbe | 14,744 | 0 | - |
| Planeten - Bildquiz | 12,875 | 0 | - |
| Ausgestorbene Tiere | 4,616 | 0 | - |
| Mathematik: Fibonacci-Folge (Kopfrechnen) | 15,964 | 0 | - |
| Animal Silhouettes - Map Quiz | 5,376 | - | - |
| Wildlife of Europe (Mammals) | 338 | - | - |
| Planeten - Multiple Choice | 6,392 | 0 | - |
| Functional Anatomy of the Brain on a Click Map | 2,005 | - | - |
| Click Every Chemical Symbol | 19,050 | - | - |
| Nonmetal Elements | 996 | - | - |
| Space Trivia | 918 | - | - |
| Speed Symbol by Element | 103,399 | 0 | - |
| Name the Virus | 76,161 | 0 | - |
| Größte Landtiere Afrikas | 5,295 | 0 | - |
| UK Birds | 1,792 | - | - |
| Wählen Sie ein Bild - Tierische Verwandtschaft | 8,250 | 0 | - |
| All Elements of The Periodic Table - Sudden Death (Hard) | 7,094 | - | - |
| Lucilia sericata microbiome | 53 | - | - |
| Structure of a Volcano | 238 | - | - |
| Große Katzen | 12,250 | 0 | - |
| Click the Element on the Periodic Table | 4,195 | - | - |
| Noble Gases | 77,305 | 0 | - |
| Medical Conditions to Synonyms - Click Quiz #1 | 132 | - | - |
| Medical Conditions to Synonyms - Click Quiz #2 | 66 | - | - |
| Outer Wilds - Astronomical objects picture quiz | 268 | - | - |
| Click a Valid Periodic Table Element A-Z | 3,328 | - | - |
| Astronomy Quiz | 81,565 | 0 | - |
| Scientific Groups of Things | 1,568 | - | - |
| Human Body A-Z | 128,177 | 0 | - |
| Chemical Elements with Short Names | 93,330 | 0 | - |
| Birds - Picture Click Quiz | 17,932 | 0 | - |
| Medical Vocabulary #2 | 2,258 | - | - |
| Medical Vocabulary | 1,471 | - | - |
| Bird Species by Family : Penguins | 325 | - | - |
| Cat Breeds - Sudden Death | 1,015 | - | - |
| Scientific Names | 78,090 | 0 | - |
| The Real Size of Animals | 1,087 | - | - |
| Historical Events - AD or BC? | 57,140 | 0 | - |
| Least Related Species 1 (Animal Phylogeny) | 128 | - | - |
| Click the Dinosaur Silhouettes | 1,883 | - | - |
| Name the Changes of State of Matter (Phase Transitions) | 670 | - | - |
| Bones - Sudden Death | 48,294 | 0 | - |
| Anatomy Vocabulary Click Quiz | 1,178 | - | - |
| Medicine and Anatomy by Letter - A | 12,359 | - | - |
| Moons of our Solar System | 2,540 | - | - |
| Chemical Elements Without First and Last Letter - Sudden Death | 30 | - | - |
| Flowers by Picture Part 1 | 184 | - | - |
| Island Extinctions | 140 | - | - |
| Terrestrial Biomes - Map Quiz | 9,617 | 0 | - |
| Animals: No Vowels #2 | 21,365 | 0 | - |
| Multiple Choice Animal Quiz #2 | 15,380 | 0 | - |
| One Letter Periodic Table Symbols - Sudden Death | 53,485 | 0 | - |
| African Animals - Sudden Death | 61,890 | 0 | - |
| Translate scientific (Latin) names of plants | 65 | - | - |
| Planets of the Solar System but I'm Still Bitter About Pluto | 145 | - | - |
| Body Parts - Sudden Death #2 | 11,820 | 0 | - |
| Chemie: Säuren | 700 | - | - |
| Organic Chemistry Functional Groups Picture Quiz | 980 | - | - |
| Layers of the Earth and Atmosphere | 50,145 | 0 | - |
| Biggest Whale Species | 246 | - | - |
| Einteilung der Lebewesen (Taxonomie) | 1,903 | 0 | - |
| The Giraffe Quiz | 77 | - | - |
| Body Part Words | 145,071 | 0 | - |
| Name the Constellations | 44,617 | 0 | - |
| Name an Animal A-Z | 23,574 | 0 | - |
| Animal Homes by Picture | 374 | - | - |
| Polyatomic Ions | 145 | - | - |
| Aquatic Mammals - Picture Click Quiz | 1,846 | - | - |
| Insects - Picture Click Quiz | 1,709 | - | - |
| Name a Valid Element | 69,502 | 0 | - |
| Name that Bug | 45,430 | 0 | - |
| 16 Questions that Prove that Physics Makes No Sense | 20,608 | 0 | - |
| One-Syllable Human Body Parts | 87,604 | 0 | - |
| Medical Prefixes and Suffixes | 2,347 | - | - |
| Mammal, Bird, or Reptile | 538 | - | - |
| Angiosperm Families to Order | 12 | - | - |
| Name That Gas! (Elements and Compounds in Chemistry) | 3,266 | - | - |
| Major Celestial Bodies in Solar System with a Map | 590 | - | - |
| Elements Whose First Letter Doesn't Match the Symbol | 16,647 | 0 | - |
| Science General Knowledge #1 | 6,761 | - | - |
| Moons of Neptune | 470 | - | - |
| Periodic Table Symbols - Sudden Death | 12,555 | - | - |
| South American Animals - Sudden Death | 28,004 | 0 | - |
| UK Butterflies By Picture | 835 | - | - |
| Animal Varieties Quiz #1 | 92,329 | 0 | - |
| Animal Varieties #3 | 55,047 | 0 | - |
| Largest Animal by Taxonomic Rank | 517 | - | - |
| Name the Metal Alloy | 13,235 | 0 | - |
| Random Elements on the Periodic Table | 11,258 | - | - |
| Types of Conifer Trees | 149 | - | - |
| Every Bone in the Human Body on a Drawing | 302 | - | - |
