Have you heard of the Royal game of Ur?
It's a 4000 year old game found in a royal gravesite in the ancient city of Ur. What's truly amazing about it is that we've also found a clay tablet with the rules for it! The oldest rule book in the world!
I had not heard of it, until I found this beautiful Free and open source online digital version of it! It looks great, and it's fun too! And you can play two player locally
Give it a go and let me know what you think!