At the moment I have about 70 installed, but I recently reinstalled my Windows 10 and the rest is on my back-up drives, or simply not downloaded at all. I own some retail (about 40), then on Steam (about 130, not even half of which are installed/downloaded), and on GoG.com (30). That's excluding the F2P games, most of which are MMORPGs (on various platforms or standalones). On my previous Windows installation I had about 85 installed, but I started to lack HDD space. I recently bought two new drives, one 4TB (WD Black) and 2TB (WD Red). I'm going to install everything I can basically, since I hate having to install / uninstall / reinstall due to lack of HDD space (which was my issue previously). I'll definitely try for the 200 installed games mark.