Andrew O’Hara, writing for AppleInsider:
Using the new Steam Link app, you can play nearly any Steam game that you can play on your Mac or PC on your iPhone, iPad, or Apple TV. There are a variety of asterisks with that, such as the fact both devices must be on the same network and connected through Ethernet or 5GHz Wi-Fi, but this is a pretty minor limitation these days.
Valve’s official Steam controller is also able to be paired directly with your iPhone, iPad, or Apple TV to control those games. If you either don’t like the divisive Steam controller, any MFi controller will work as well, including the exceptional Steel Series Nimbus.
I don’t own a particularly powerful Mac at the moment, but in a few months, I should have a new iMac on my desk. And I’m very excited about the notation of playing high-quality, modern games in my living room without having to shell out hundreds of dollars for a dedicated gaming console.