Have been messing around with some of my favourite retro-games.
For example, Dragon Wars. I hacked the DOS version gently in order to explore parts that are not available while playing. One fruit is the attached complete 32x47 world map of Dilmun. This map includes two small islands in the far east that I've never seen on any other map, although one of them is visible from Freeport's island. My party has walked on them! (Alas, both islands are empty.)





