DUAL 2-BACK · 20 ROUNDS
Track a grid position and a tone at the same time, then compare both with N steps ago.
Complete 20 scored rounds at 2-back. Errors count, then the next round continues.
Each tone also has a visible marker. You can play muted.
READY?
Two memory samples appear first. Then compare every new pair with two steps earlier.
Tap an answer or press 1–4. POSITION means only the location matches; SOUND means only the tone matches.
HOW TO PLAY
Watch the highlighted square while hearing the tone and seeing its four-level visual marker.
After the memory samples, compare both parts of the current stimulus with the one N steps earlier.
Choose NEITHER, POSITION, SOUND, or BOTH before the answer bar empties.
TWO STREAMS
Each trial combines one of nine locations with one of four tones. A match can occur in either stream, both streams, or neither.
The tone marker mirrors the audio pitch, so muted play follows exactly the same answer rules.
ENTERTAINMENT ONLY
Standard mode uses five targets of each answer type for a balanced 20-round result. Response time is calculated from correct answers.
This is a recreational memory game for personal practice, not a medical, psychological, or cognitive diagnosis.
QUESTIONS
Compare the current position and tone with the pair shown exactly two trials earlier, not the immediately previous trial.
Yes. The four-bar tone marker provides the same low-to-high identity as the sound. Use the SOUND ON button to mute or restore audio.
Endless begins at 1-back and raises the N level after every six consecutive correct answers. One error or timeout ends the run.
No. It is an entertainment and practice game, and its result should not be treated as a clinical measurement.