The five objects from the Size It Up puzzle on October 4, 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.
ROUND 1
Diplodocus — 25 m
Answer: a Diplodocus measures 25 m (length / span), which is 1.1× as big as the reference, a Brachiosaurus at 22 m.
Almost half of Diplodocus was tail, which may have cracked like a whip.
How people guessed: across 50 runs the typical guess was 24.4 m — almost exactly right.
Answer: the Moon measures 3,474.8 km (length / span), which is about 1.2× smaller than the reference, Australia at 4,000 km.
The Moon’s mean diameter is about 3,475 kilometres.
How people guessed: across 50 runs the typical guess was 4,545.7 km — 31% too large. The most common miss is picturing the Moon far bigger than Australia really allows.
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.