I've been using Apple computers since 1980. The Mac has never been a game machine, and I've never been much of a gamer. But here's a list of the games that work on my iMac. I bought all of them cheap from Steam.
My system:
imac 21.5" mid 2011
2.8 Ghz Intel Core i7
32 GB RAM
AMD Radeon HAD 6770m 512 MB
Mac OS Sierra 10.12.6
American Truck Simulator
Anchorhead
Burly Men at Sea
Car Mechanic Simulator 15
Cook, Serve, Delicious
Depression Quest
Euro Truck Simulator 2
Farming Simulator 15
Firewatch
GRID Autosport
Orwell
Over the Alps
Papers, Please
Rainswept
The Stanley Parable
This is the Police
This is the Police 2
This War of Mine
Transport Fever
Tropico 4
Note: SimCity 4 Deluxe will work, but it requires some effort and tweaking, and it will occasionally crash. See the site Simtropolis. They have a section for Mac users.
My system:
imac 21.5" mid 2011
2.8 Ghz Intel Core i7
32 GB RAM
AMD Radeon HAD 6770m 512 MB
Mac OS Sierra 10.12.6
American Truck Simulator
Anchorhead
Burly Men at Sea
Car Mechanic Simulator 15
Cook, Serve, Delicious
Depression Quest
Euro Truck Simulator 2
Farming Simulator 15
Firewatch
GRID Autosport
Orwell
Over the Alps
Papers, Please
Rainswept
The Stanley Parable
This is the Police
This is the Police 2
This War of Mine
Transport Fever
Tropico 4
Note: SimCity 4 Deluxe will work, but it requires some effort and tweaking, and it will occasionally crash. See the site Simtropolis. They have a section for Mac users.