Guess the 9-letter word. Every guess adds a new row to your beat — right letters hit hard, close-but-wrong letters land off the beat, wrong letters still get their own real drum hit instead of going silent, and vowels always add their own drum color.
Grade 8 words are long enough to need two beats each, so this grade always gets 4 guesses no matter what the site-wide setting is — a full pattern only has 8 beats to work with.