DAILY NO. 13 · VERIFIED MEASUREMENTS
The five dinosaurs objects from the Size It Up puzzle on September 13, 2026, with the measured size of each, the reference it was compared against, a source you can check, and how the community's guesses landed. Want the surprise first? Replay this puzzle — archived days never touch your streak.
Answer: a Brachiosaurus measures 22 m (length / span), which is about 1.1× smaller than the reference, a Diplodocus at 25 m.
Brachiosaurus held its neck upward, making it far taller than long-tailed sauropods of similar length.
Common miss: players tend to inflate a Brachiosaurus when it sits beside a Diplodocus — big things get squeezed, small familiar things get stretched.
Answer: an Allosaurus measures 8.5 m (length / span), which is about 1.1× smaller than the reference, a Stegosaurus at 9 m.
The common large predator of its day: far more Allosaurus fossils exist than T. rex ones.
Common miss: players tend to inflate an Allosaurus when it sits beside a Stegosaurus — big things get squeezed, small familiar things get stretched.
Answer: an Iguanodon measures 10 m (length / span), which is about 1.1× smaller than the reference, an American school bus at 10.7 m.
Its thumb spike was first reconstructed, wrongly, as a horn on the nose.
Common miss: players tend to inflate an Iguanodon when it sits beside an American school bus — big things get squeezed, small familiar things get stretched.
Answer: a Tyrannosaurus rex measures 12.3 m (length / span), which is about 1.2× smaller than the reference, a Spinosaurus at 15 m.
A large T. rex reached around 12.3 metres long.
Common miss: players tend to inflate a Tyrannosaurus rex when it sits beside a Spinosaurus — big things get squeezed, small familiar things get stretched.
Answer: 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.
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.