It depends on the system you are on and the game you want to play. There were a lot of games for System 6 on B/W Macs even though color was out for the Mac II series. But the LCs ended all that with affordable color system, a larger RAM Footprint and faster CPU and many games went to the LCs (and consequently to the Mac II series).

Then System 7 came out adding system features to programs, and games slid into that too. It would be difficult to play Spectre VR Tank battle game on a SE/30 even if you had the larger RAM and System 7 but no color. Even if you can play Spectre VR on a Mac Plus, the 68K is too slow and no FPU to assist in drawing all those polygon shapes (Spectre VR is slow on a LC without a FPU compared to similarly configured Mac IIci with a FPU).

So all this has a lot of dependencies you need to think about: what system you want it on, what CPU (and FPU), color or B/W and how much RAM you would have. Things like I/O is secondary but really necessary, a hard drive is a must for games so that counts out the 128K and 512K\Ke series. I remember using 2 floppy drives to play games in the old days, and swapping a third disk back and forth on the second drive!