Games I've got currently installed on my own Mac:

These are the sources I've used to create the first version of this list:

I thought it'd be a good idea to make a topic where we can see what games do support 64-bit and what games are still 32-bit. Of course nothing is 100% sure, as plans can always change, but the way it's looking right now it seems as if macOS Mojave, which will be released this fall, will be the last version of macOS to support 32-bit apps, so the version of macOS that'll be released in fall 2019 will be the first operating system for Macs that will be 64-bit only.