ROMs are your best bet for more play with less storage required. Older games are insanely small by today's standard, often coming in at under a single 600MB disc in size, but console games blow even that out of the water. N64 games are tens of megs, while earlier platforms are only a couple of megs a piece.
PlayStation games are all around that 6-700MB per disc and some games are multiple discs, but that is still way less than the size of modern games. Also a lot of them can play fairly well from a high compression format like 7z, so you can store then compressed.
Also, some games that are older have newer open source engines which can really breathe new life into them. My first example would be OpenMW for Morrowind, but DevilutionX is another great example. Trying to get Diablo running in modern hardware is entirely possible, but the resolution is very limited and it is super clunky. DevilutionX has more options and it is a much more enjoyable experience.
Also, Creeper World 3. I have put 50 full days of my life into that game and regret nothing.
Some things I have noticed.
It looks like the Red Sea is also filled in.
It appears that other areas at the north of Europe have had some areas filled.
Sri Lanka now appears to have a land bridge to India.
Lake Victoria and Lake Malawi are both also filled in.
Sudan and South Sudan are just one country, which makes sense given that change was only recognised in 2011.