TrioNinePuzzle notes
This original practice board has nine words and three intended categories. Look for specific shared meanings rather than a broad association. It is part of TrioNine’s 38-puzzle collection, published October 1, 2026.
Words on this board: KILO, CENTI, MILLI, SPIDER, SCORPION, TICK, AFRICA, EUROPE, ANTARCTICA.
Reveal this puzzle’s three groups and explanations
Metric prefixes
KILO · CENTI · MILLI
These prefixes represent powers of ten.
Invertebrates with eight legs
SPIDER · SCORPION · TICK
These arachnids have eight legs as adults.
Continents
AFRICA · EUROPE · ANTARCTICA
These are continents.