| Human Biology Multiple Choice Quiz #2 | 17,333 | - | - |
| Human Biology Multiple Choice Quiz #1 | 11,810 | - | - |
| Human Biology Multiple Choice Quiz #3 | 5,482 | - | - |
| Largest Types of Birds | 27,005 | 0 | - |
| Mythical Creatures Quiz #1 | 709,484 | 0 | - |
| Animal Adjectives | 60,150 | 0 | - |
| Animal Anatomy Quiz | 59,921 | 0 | - |
| Snake Knowledge | 18,852 | 0 | - |
| Medical Acronyms | 97,126 | 0 | - |
| Säugetiere nach Bildern #1 | 14,098 | 0 | - |
| Family Vocabulary - Decipher the Relationships | 165 | - | - |
| Countries with the Most Species | 103,425 | 0 | - |
| Flowers by Picture | 105,801 | 0 | - |
| Animals that Start with F | 107,363 | 0 | - |
| Fish by Picture #1 | 108,740 | 0 | - |
| Bird Knowledge #1 | 15,769 | 0 | - |
| Animal Ranges - Do They Live There? | 44,348 | 0 | - |
| Countries with the Most Wolves | 108,431 | 0 | - |
| Top 10 Countries with the Most Horses | 69,184 | 0 | - |
| Top 15 Countries with the Most Cows | 107,420 | 0 | - |
| Groups of Two - Science | 48,422 | 0 | - |
| Animal Varieties #2 | 66,798 | 0 | - |
| Name Every Fruit | 1,525 | - | - |
| Animals of Australia | 42,433 | 0 | - |
| Elements that are Gases at Room Temperature | 64,902 | 0 | - |
| PSE Quiz | 343,923 | 0 | - |
| Word Scramble - Random Animals | 49,374 | 0 | - |
| Birds - Sudden Death | 68,412 | 0 | - |
| Biology General Knowledge #1 | 1,376 | - | - |
| Bird Knowledge #2 | 14,223 | 0 | - |
| Dinosaur Picture Quiz | 1,160 | - | - |
| Scientific Animal Names | 668 | - | - |
| Mammals - Sudden Death | 86,050 | 0 | - |
| Click on the Fish (Sudden Death) | 4,590 | - | - |
| Insects - Sudden Death | 11,386 | - | - |
| Dog Breeds - Sudden Death | 77,241 | 0 | - |
| Countries With The Most Dogs | 977 | - | - |
| Animals - Sudden Death | 4,505 | - | - |
| UK Birds | 227 | - | - |
| Birds by Picture #1 | 41,931 | 0 | - |
| All Valid Dinosaur Genera | 3,533 | - | - |
| Marketing Slogans for Animals | 29,335 | 0 | - |
| Animal Look-Alikes #2 | 2,212 | - | - |
| Alpacas or Llamas | 247 | - | - |
| Math symbols and functions quiz | 1,884 | - | - |
| Geologic Eons, Eras and Periods | 2,816 | - | - |
| Celsius, Fahrenheit or Kelvin? | 646 | - | - |
| Mammals by Picture #3 | 62,387 | 0 | - |
| Anatomy of the Ankle and Foot on a Click Map | 1,171 | - | - |
| Birds by Picture #2 | 36,605 | 0 | - |
| Lebensräume von Tieren - leben sie dort? | 14,629 | 0 | - |
| All bones of the human skull (side view) | 2,134 | - | - |
| Countries With the Most Biodiversity - Sudden Death | 1,682 | - | - |
| Where Does It Grow? Click Quiz #1 | 58,641 | 0 | - |
| Bärenarten | 10,912 | 0 | - |
| Animal Tracks | 290 | - | - |
| Click the Animals - German | 1,090 | - | - |
| Reptiles - Sudden Death | 8,731 | - | - |
| Marine Animals - Sudden Death | 7,646 | - | - |
| Common Names for B Group Vitamins | 289 | - | - |
| Birds by Picture #3 | 33,394 | 0 | - |
| Man Outruns Slow Animals - Sudden Death | 95,995 | 0 | - |
| Australian Animals - Sudden Death | 80,052 | 0 | - |
| Animal Look-Alikes #1 | 3,351 | - | - |
| Native Animals of New Zealand by Picture | 285 | - | - |
| Confusing Animal Names - Picture Quiz | 3,743 | - | - |
| Baby, Male and Female Animals | 150,904 | 0 | - |
| Zufälliges Symbol zum Element | 4,475 | 0 | - |
| Vertebrates - Sudden Death | 3,012 | - | - |
| Liquids - Sudden Death! | 3,150 | - | - |
| Kopf-an-Kopf - Tiere | 23,943 | 0 | - |
| Flying Animals - Sudden Death | 7,169 | - | - |
| Countries with Wild Pangolins | 1,160 | - | - |
| Monkeys and Apes - Picture Click Quiz | 3,533 | - | - |
| Klicken Sie auf das chemische Element | 20,523 | 0 | - |
| Fish - Sudden Death | 15,817 | - | - |
| Dog Breed Picture Quiz | 206,514 | 0 | - |
| Parts of a leaf - Map Quiz | 413 | - | - |
| Animals by Range on a World Map | 25,734 | 0 | - |
| Name Every North American Bird | 1,980 | - | - |
| Säugetiere A-Z - Bilderquiz | 14,555 | 0 | - |
| Random Atomic Number to Element | 1,191 | - | - |
| Cultivars of Brassica oleracea | 436 | - | - |
| Chemische Elemente mit höchstens 4 Buchstaben | 6,760 | 0 | - |
| Objects in space - sudden death | 2,108 | - | - |
| Most Common Elements in the Human Body | 152,306 | 0 | - |
| Bones of the Human Body | 43,321 | 0 | - |
| Klicken Sie auf den Planeten | 16,087 | 0 | - |
| Bäume anhand ihrer Blätter - Bildquiz | 4,812 | 0 | - |
| Animal Group Names | 23,258 | 0 | - |
| Body Parts - Sudden Death #1 | 66,450 | 0 | - |
| Bovid Species | 421 | - | - |
| Most Common Animal Words | 37,773 | 0 | - |
| Heimische Vögel Bildquiz #1 | 3,401 | 0 | - |
| Random Sequential Elements on the Periodic Table | 4,491 | - | - |
| Egg Laying Animals - Sudden Death | 5,400 | - | - |
| Körperteile mit nur einer Silbe | 15,351 | 0 | - |
| Planeten - Bildquiz | 13,644 | 0 | - |
| Ausgestorbene Tiere | 4,746 | 0 | - |
| Mathematik: Fibonacci-Folge (Kopfrechnen) | 16,833 | 0 | - |
| Animal Silhouettes - Map Quiz | 5,437 | - | - |
| Wildlife of Europe (Mammals) | 345 | - | - |
| Planeten - Multiple Choice | 6,688 | 0 | - |
| Functional Anatomy of the Brain on a Click Map | 2,084 | - | - |
| Click Every Chemical Symbol | 19,713 | - | - |
| Nonmetal Elements | 1,001 | - | - |
| Space Trivia | 1,019 | - | - |
| Speed Symbol by Element | 105,265 | 0 | - |
| Name the Virus | 76,993 | 0 | - |
| Größte Landtiere Afrikas | 5,346 | 0 | - |
| UK Birds | 1,831 | - | - |
| Wählen Sie ein Bild - Tierische Verwandtschaft | 8,637 | 0 | - |
| All Elements of The Periodic Table - Sudden Death (Hard) | 7,792 | - | - |
| Lucilia sericata microbiome | 53 | - | - |
| Structure of a Volcano | 238 | - | - |
| Große Katzen | 12,444 | 0 | - |
| Click the Element on the Periodic Table | 4,996 | - | - |
| Noble Gases | 78,629 | 0 | - |
| Medical Conditions to Synonyms - Click Quiz #1 | 142 | - | - |
| Medical Conditions to Synonyms - Click Quiz #2 | 73 | - | - |
| Outer Wilds - Astronomical objects picture quiz | 280 | - | - |
| Click a Valid Periodic Table Element A-Z | 3,736 | - | - |
| Astronomy Quiz | 83,037 | 0 | - |
| Scientific Groups of Things | 1,598 | - | - |
| Human Body A-Z | 129,519 | 0 | - |
| Chemical Elements with Short Names | 94,567 | 0 | - |
| Birds - Picture Click Quiz | 19,644 | 0 | - |
| Medical Vocabulary #2 | 2,459 | - | - |
| Medical Vocabulary | 1,596 | - | - |
| Bird Species by Family : Penguins | 339 | - | - |
| Cat Breeds - Sudden Death | 1,044 | - | - |
| Scientific Names | 78,652 | 0 | - |
| The Real Size of Animals | 1,129 | - | - |
| Historical Events - AD or BC? | 57,761 | 0 | - |
| Least Related Species 1 (Animal Phylogeny) | 136 | - | - |
| Click the Dinosaur Silhouettes | 2,096 | - | - |
| Name the Changes of State of Matter (Phase Transitions) | 687 | - | - |
| Bones - Sudden Death | 53,238 | 0 | - |
| Anatomy Vocabulary Click Quiz | 1,215 | - | - |
| Medicine and Anatomy by Letter - A | 12,656 | - | - |
| Moons of our Solar System | 2,665 | - | - |
| Chemical Elements Without First and Last Letter - Sudden Death | 31 | - | - |
| Flowers by Picture Part 1 | 198 | - | - |
| Island Extinctions | 141 | - | - |
| Terrestrial Biomes - Map Quiz | 21,636 | 0 | - |
| Animals: No Vowels #2 | 22,620 | 0 | - |
| Multiple Choice Animal Quiz #2 | 15,496 | 0 | - |
| One Letter Periodic Table Symbols - Sudden Death | 56,728 | 0 | - |
| African Animals - Sudden Death | 68,830 | 0 | - |
| Translate scientific (Latin) names of plants | 68 | - | - |
| Planets of the Solar System but I'm Still Bitter About Pluto | 149 | - | - |
| Body Parts - Sudden Death #2 | 45,344 | 0 | - |
| Chemie: Säuren | 755 | - | - |
| Organic Chemistry Functional Groups Picture Quiz | 1,031 | - | - |
| Layers of the Earth and Atmosphere | 50,631 | 0 | - |
| Biggest Whale Species | 252 | - | - |
| Einteilung der Lebewesen (Taxonomie) | 1,938 | 0 | - |
| The Giraffe Quiz | 78 | - | - |
| Body Part Words | 146,272 | 0 | - |
| Name the Constellations | 45,209 | 0 | - |
| Name an Animal A-Z | 25,871 | 0 | - |
| Animal Homes by Picture | 416 | - | - |
| Polyatomic Ions | 164 | - | - |
| Aquatic Mammals - Picture Click Quiz | 2,007 | - | - |
| Insects - Picture Click Quiz | 1,892 | - | - |
| Name a Valid Element | 70,297 | 0 | - |
| Name that Bug | 45,609 | 0 | - |
| 16 Questions that Prove that Physics Makes No Sense | 20,913 | 0 | - |
| One-Syllable Human Body Parts | 88,447 | 0 | - |
| Medical Prefixes and Suffixes | 2,435 | - | - |
| Mammal, Bird, or Reptile | 545 | - | - |
| Angiosperm Families to Order | 12 | - | - |
| Name That Gas! (Elements and Compounds in Chemistry) | 3,421 | - | - |
| Major Celestial Bodies in Solar System with a Map | 631 | - | - |
| Elements Whose First Letter Doesn't Match the Symbol | 18,453 | 0 | - |
| Science General Knowledge #1 | 6,861 | - | - |
| Moons of Neptune | 476 | - | - |
| Periodic Table Symbols - Sudden Death | 13,162 | - | - |
| South American Animals - Sudden Death | 31,636 | 0 | - |
| UK Butterflies By Picture | 901 | - | - |
| Animal Varieties #1 | 93,079 | 0 | - |
| Animal Varieties #3 | 55,528 | 0 | - |
| Largest Animal by Taxonomic Rank | 534 | - | - |
| Name the Metal Alloy | 13,954 | 0 | - |
| Random Elements on the Periodic Table | 11,439 | - | - |
| Types of Conifer Trees | 152 | - | - |
| Every Bone in the Human Body on a Drawing | 491 | - | - |
| Constellation Map | 6,888 | - | - |
