Common Consensus is a fun, self-sustaining web-based game that both collects and validates commonsense knowledge about everyday goals. Goals are a key element of commonsense knowledge; in many of our inferface agents, we need to recognize goals from user actions (plan recognition), and generate sequences of actions that implement goals (planning). We also often need to answer more general questions about the situations in which goals occur, such as when and where a particular goal might be likely, or how long it is likely to take to achieve.