SortStack #204 — 2026-12-30

By speed · Order from slowest to fastest.

1. A crawling slug 30 m/h

   A slug glides on a ribbon of self-made slime, which lets it cross even a razor's edge unharmed.

2. A crawling baby 1.4 km/h

   Babies often invent their own crawling styles, from the classic hands-and-knees to a one-legged commando shuffle.

3. A king penguin waddling on land 2.8 km/h

   A penguin's waddle is surprisingly efficient, storing and releasing energy with each side-to-side rock.

4. A migrating monarch butterfly 8 km/h

   Monarchs migrate thousands of kilometres to the same forests their great-grandparents left, guided by instinct alone.

5. A car cruising the German autobahn 200 km/h

   Parts of Germany's autobahn have no speed limit, where ordinary sedans legally travel faster than racetracks allow elsewhere.

6. A Formula 1 car at top speed 372 km/h

   An F1 car generates so much downforce it could, in theory, drive upside down on a ceiling at speed.

← All puzzles · Play today’s SortStack