How can I find out what Arcade games I don't own?

Games
1

I have a lot of 360 arcade games. By alot I mean probably 80 to 100. I wish there was a way to generate a list of 360 arcade games I don’t have. Any ideas?

2

Here’s a list of XBLA games that looks like it’s kept updated. So you could manually see which ones you don’t have and copy and paste those names into a file? Pretty low tech, but it would work.