FOUR-TONE SEARCH · 20 ROUNDS
Listen to four short tones and choose the one that sounds different.
Play 20 rounds. Every odd position appears exactly five times; mistakes count, then play continues.
READY?
Listen for one tone with a different pitch or tone color.
Keyboard: 1, 2, 3, or 4 · Touch or mouse: use the four large position buttons. Answers unlock after sound four.
HOW TO PLAY
Start with a click or tap so the browser can enable audio, then listen to all four sounds.
Three sounds match. One differs slightly in pitch or waveform tone color.
After sound four, choose the odd position from 1 to 4 before the timing bar empties.
AUDITORY DIFFERENCE SEARCH
A pitch trial changes the odd tone's frequency. A timbre trial keeps pitch constant but adds a small harmonic difference to its waveform.
Standard mode balances all four positions. Endless mode gradually reduces the audible difference and shortens answer time.
ENTERTAINMENT CHALLENGE
This game is for entertainment and personal listening practice. It is not an audiogram, hearing screening, or diagnostic auditory-processing test.
Use a comfortable volume and stop if sound causes discomfort. Audio equipment, background noise, and practice can change results.
QUESTIONS
Listen for one tone that has a different pitch or a subtly different tone color from the other three.
No. All pulses are deliberately identical; they only help track the four sound positions.
Pitch and timbre differences become smaller, the answer window shrinks, and one miss ends the run.
No. It is a recreational sound-difference game, not a medical or diagnostic assessment.