Decoder

A key pairs each digit with a symbol. A symbol flashes up — punch in the digit it stands for, as fast as you can before the clock runs out. The Wechsler digit-symbol test of raw processing speed.

Trains: Processing speed · Category: Attention & Speed

How to play: Decoder is a free, browser-based brain-training game in the Brain Gym suite. Play it instantly — no sign-up, works offline, and your best scores are saved on your device.

Play Decoder · All Brain Gym games