Find four groups of four. Four mistakes and the day’s over.
The first two stages narrow the puzzle without spoiling groups. The reveal stages need an additional click each.
Today's 16 words are spread across the alphabet. The most common starting letters are R (3×), O (2×), S (2×), H (2×).
The yellow group's theme is "Pizza toppings". That's the easiest grouping; pick the four words that fit and you're a quarter of the way through.
The four yellow words are: PEPPERONI, MUSHROOM, OLIVE, ONION.
The four categories, in order from easiest to hardest, are: Yellow (easiest): "Pizza toppings" · Green: "Forms of precipitation" · Blue: "Boxing terms" · Purple (trickiest): "Star Wars characters".
Below is the full grouping; each row is one category.