Saturday Mac riddles 81

Here are this weekend’s riddles to entertain you through whatever you’re now allowed to do.

1: I’m the only game you can’t get rid of. What am I?

2: I could change brightness, mute, or open Launchpad. What am I?

3: Tempering, becoming obdurate, and what’s needed for checking.

I will post the answers first thing on Monday morning.

Please don’t post your answers as comments here: it spoils it for others.