About the Gemstones Odd One Out Game
A rapid visual-scanning challenge. A grid fills with the same picture repeated over and over — except one tile, which is different. Spot it and tap it before the clock runs out. Every round the grid grows and the clock gets tighter.
Diamonds, crystals, crowns and buried treasure — the gemstone deck glitters with everything a rockhound or jewel thief could dream of. Dig deep and unearth the matching pairs.
How to Play
- Press Start. A grid appears — almost every tile shows the same picture.
- Scan the grid for the one tile that is different.
- Tap it before the timer runs out.
- Each round adds more tiles and less time. Three misses ends the run.
Why Play Odd One Out?
- Trains rapid visual scanning and selective attention
- No memorising required — pure focus under time pressure
- Short, snappy rounds that get genuinely tricky fast
Fun Facts About Gemstones
- Diamonds are made of pure carbon — the same element as pencil lead.
- Rubies and sapphires are the same mineral, corundum, in different colours.
- The biggest diamond ever found, the Cullinan, weighed over 3,100 carats rough.
- Each month of the year has its own traditional birthstone.