Play NYT Connections Puzzle #840 Mon, Aug 18

Find groups of four related words Need hints?

Solve NYT Connections puzzle #840 - Group 16 words into 4 categories: CUE, NOD, PROMPT, SIGNAL, BREAK, CHANCE, OPENING, SHOT, BREAKFAST, PARKING, POOL, WI-FI, DIGITAL, POCKET, STOP, WRIST.