How many squares are in the grid?

A 3×3 grid of nine emoji — small enough to study quickly, large enough that the one change isn't always obvious.

Does only one square ever change?

Yes, exactly one square changes each round, so there's always a single correct answer to find.

A few seconds, enough for one careful pass over all nine emoji, but not long enough to casually skim without focusing.

Memorize a grid of emoji, then spot which square changed.

Runs in your browser

Memorize a grid of emoji, then spot which square changed once it reappears.

1Click "Start" to study a grid of emoji.
2Once it's hidden and reappears, one square will have changed.
3Click the square you think changed.
4Keep going for several rounds — your score is how many changes you correctly spotted.

Card Flip Match

Flip two cards at a time to find matching pairs before the timer runs out.

Grocery List Memory

Memorize a short shopping list, then pick which item was actually on it.

Word Memory Match

Flip cards to find matching word/definition pairs.

Sequence Recall

Watch a growing sequence flash, then repeat it back in order.

Distraction Focus Test

Spot the target word hiding among near-identical decoys.

Number Recall Ladder

Memorize a digit string, then type it back — each round adds one more digit.