Guess the 10-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 10 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.