DAILY NO. 18 · VERIFIED MEASUREMENTS
Today's five dinosaurs Size It Up comparisons with the measured size of each object, its reference and a source you can check. The puzzle is still live, so every answer stays hidden until you tap it. Haven't played yet? Play today's puzzle first.
The October 9, 2026 puzzle ran from a Stegosaurus at 9 m to an Argentinosaurus at 33 m — about 4× apart, drawing on dinosaurs. The pair furthest apart was round 2: a Brachiosaurus is 1.8× as big as a Tyrannosaurus rex.
Answer: Stegosaurus — 9 m. A Stegosaurus measures 9 m (length / span), which is 1.1× as big as the reference, an Ankylosaurus at 8 m.
A brain the size of a lime, in a body as long as a bus.
Common miss: players tend to compress a Stegosaurus when it sits beside an Ankylosaurus — big things get squeezed, small familiar things get stretched.
Answer: Brachiosaurus — 22 m. A Brachiosaurus measures 22 m (length / span), which is 1.8× as big as the reference, a Tyrannosaurus rex at 12.3 m.
Brachiosaurus held its neck upward, making it far taller than long-tailed sauropods of similar length.
Common miss: players tend to compress a Brachiosaurus when it sits beside a Tyrannosaurus rex — big things get squeezed, small familiar things get stretched.
Answer: Spinosaurus — 15 m. A Spinosaurus measures 15 m (length / span), which is 1.4× as big as the reference, an American school bus at 10.7 m.
The longest predatory dinosaur known, and probably one that spent much of its life in water.
Common miss: players tend to compress a Spinosaurus when it sits beside an American school bus — big things get squeezed, small familiar things get stretched.
Answer: Argentinosaurus — 33 m. An Argentinosaurus measures 33 m (length / span), which is about 1.1× smaller than the reference, a Space Shuttle orbiter at 37.3 m.
Some estimates place this giant at more than 30 metres long.
Common miss: players tend to inflate an Argentinosaurus when it sits beside a Space Shuttle orbiter — big things get squeezed, small familiar things get stretched.
Answer: Parasaurolophus — 9.5 m. A Parasaurolophus measures 9.5 m (length / span), which is 1.1× as big as the reference, a Triceratops at 9 m.
The hollow head crest may have worked like a trumpet.
Common miss: players tend to compress a Parasaurolophus when it sits beside a Triceratops — big things get squeezed, small familiar things get stretched.
Sizes are measured along the axis named in each round and link to their published source. Explore the full library by category, or read how scoring works.