Oh, you think you have good #memory? Try playing this #game based on the #Unicode #RIS (#RegionalIndicatorSymbols), featuring 258 pairs: #uniFlags
http://uniflags.oblomov.eu/

I bet it doesn't even fit in your screen.

If you care about how I got to this one, there's a little bit of history here:

http://wok.oblomov.eu/mathesis/six-cm-per-flag/
http://wok.oblomov.eu/ludica/uniflags/

What's you best run? Mine so far has been 892 turns with 1150 pairs revealed.