All of them? If we are assuming I learned the world was going to end in a week and all humans aside from a small random group are screwed and somehow magically no game will help humanity survive better or rebuild better think I would focus on getting older games, good flash games, and a healthy dose of highly degenerate toonish / anime games. Older games and flash games take up less data space. That way you can save more. They are a cultural foundation of ours too. Some of which absolutely are treasures of our species. Newer games aside from indies are mostly shit anyway. As for the others ( ͡° ͜ʖ ͡°) well they are less likely to be preserved by others.