Longest Cave Systems Game — Higher or Lower?
Mammoth Cave 686 km. Higher-or-lower cave system length quiz across 30 of the world’s longest.
Nature
Largest Insects Game — Higher or Lower?
Goliath beetle 100g. Higher-or-lower insect body size quiz across 30 of the world’s biggest bugs.
Spider Leg Span Game — Higher or Lower?
Goliath bird-eater 30 cm. Higher-or-lower spider leg-span quiz across 30 species.
Snake Length Game — Higher or Lower?
Reticulated python 7m. Higher-or-lower snake length quiz across 30 species.
Mammal Brain Weight Game — Higher or Lower?
Sperm whale brain 8 kg. Mouse 0.5 g. Higher-or-lower mammal brain weight quiz across 30 species.
Country Biodiversity Game — Higher or Lower?
Brazil: 100,000+ species. Higher-or-lower country biodiversity quiz across 30 nations.
Oldest Tree Age Game — Higher or Lower?
Bristlecone Pine: 4,800+ years. Higher-or-lower oldest-tree-by-species quiz across 30 long-lived species.
Historic Earthquake Magnitude Game — Higher or Lower?
Valdivia 1960: M9.5. Higher-or-lower magnitude quiz across 30 of history’s most powerful earthquakes.
Volcano VEI Game — Higher or Lower?
Tambora 1815: VEI 7. Mount St. Helens: VEI 5. Higher-or-lower volcanic explosivity quiz across 30 historic eruptions.
Endangered Species Population Game — Higher or Lower?
Vaquita: 10 left. African elephants: 415,000. Higher-or-lower wild population quiz across 30 endangered species.