The Rhythm Switch
Listen to short synthetic pulse loops, find where the grouping switches between fours and threes, then match patterns and do simple timing arithmetic.
The sounds are simple tones invented for this quiz, with a fixed legend (high tone starts a group, low tone continues it). Every audio task has a text transcript, so you can play it without sound.
Your choices are summarized at the end, and any tasks with right answers are checked separately. Progress is kept in this browser only so you can resume.