Countable:
* When referring to individual insects: "There were several crickets chirping in the grass."
* When referring to individual games: "We watched three crickets on TV yesterday."
Uncountable:
* When referring to the sport in general: "I love playing cricket."
* When referring to the sound of crickets: "The cricket was loud and annoying."
It's important to consider the context to determine if it's countable or uncountable.