Symbol Digit Coding
Match symbols to digits as fast as you can. The key stays visible — pure processing speed.
Symbol Digit Coding
Match the symbol (or letter) to its digit. The key stays visible — go as fast as you can.
90 seconds · 4 progressive levels · no per-trial timeout
You start with letters — then advance to symbols
Level 1 (letters)
A1
B2
C3
D4
E5
Level 4 (symbols)
★1
◆2
●3
▲4
■5
♥6
♠7
✦8
⬟9
Each game shuffles a new random mapping. Advance by answering quickly and accurately.
See stimulus→Find it in key→Tap the digit