ALL ANSWERS · DINOSAURS · DAILY No. 25 · SEPTEMBER 28, 2026
Size It Up Dinosaurs answer: September 28
The five Dinosaurs silhouettes for September 28, with the true sizes. If you have not played yet, this page is a spoiler — play these five first, then come back to argue with the numbers.
Day 25 ran from a hypsilophodon (2 m) to a brontosaurus (22 m). The widest gap was round 4, Europasaurus against Brontosaurus, at 3.5×; the closest call was round 3, Kentrosaurus against Australovenator, only 1.0× apart — the kind of round that separates a 90 from a 60.
SPOILER · TODAY’S FIVE
You have not finished today’s puzzle on this device. The answers below are blurred so you can still play first.
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ROUND 1
Maiasaura Maiasaura peeblesorum vs Spinosaurus Spinosaurus aegyptiacus
Spinosaurus · reference · 14 m Maiasaura · true length · 9 m 1.6× shorter than the spinosaurus
Maiasaura is represented here by a selected estimated total length of 9 m. Dinosaur reconstructions vary; this is the published estimate used for this comparison.
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ROUND 2
Polacanthus Polacanthus foxii vs Hypsilophodon Hypsilophodon foxii
Hypsilophodon · reference · 2 m Polacanthus · true length · 5 m 2.5× longer than the hypsilophodon
Polacanthus is represented here by a selected estimated total length of 5 m. Dinosaur reconstructions vary; this is the published estimate used for this comparison.
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ROUND 3
Kentrosaurus Kentrosaurus aethiopicus vs Australovenator Australovenator wintonensis
Australovenator · reference · 5 m Kentrosaurus · true length · 5 m 1.0× longer than the australovenator
Kentrosaurus is represented here by a selected estimated total length of 5 m. Dinosaur reconstructions vary; this is the published estimate used for this comparison.
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ROUND 4
Europasaurus Europasaurus holgeri vs Brontosaurus Brontosaurus excelsus
Brontosaurus · reference · 22 m Europasaurus · true length · 6.2 m 3.5× shorter than the brontosaurus
Europasaurus is represented here by a selected estimated total length of 6.2 m. Dinosaur reconstructions vary; this is the published estimate used for this comparison.
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ROUND 5
Tyrannosaurus rex Tyrannosaurus rex vs Mamenchisaurus Mamenchisaurus hochuanensis
Mamenchisaurus · reference · 22 m Tyrannosaurus rex · true length · 12 m 1.8× shorter than the mamenchisaurus
Tyrannosaurus rex is represented here by a selected estimated total length of 12 m. Dinosaur reconstructions vary; this is the source value used for this comparison.
Beat these tomorrow
Every round is worth up to 100 points: within 6% of the true size scores 100, half or double scores 45, five times off scores zero. The daily puzzle is the same five for everyone and refreshes at midnight in your time zone; if you want more than five, Size It Up Unlimited draws fresh pairs from the whole library for as long as you like.