Goal

The key at the top pairs each symbol with a digit. A symbol appears — tap its digit on the keypad as fast as you can. Match as many as you can in 60 seconds.

Levels

• You start with 4 symbols in the key. Each level adds one more, up to 9.
• 8 right answers moves you up a level; 3 wrong in a row moves you down.
• Every level change deals a brand-new key — so keep reading it, don't just memorise it.

Scoring

A right answer earns 4 + the level. A wrong one costs 3. Get 10 in a row to build a streak.

Processing Speed

Symbol–digit coding is the classic test psychologists use to measure processing speed: how fast you can take in something new, look it up and act on it.

Visual Scanning

Finding the symbol in the key and the digit on the pad, again and again, trains quick, efficient eye movements.