The boardgame is REAL good. This is a fun abstract strategy game.
After you complete the game, allow the Credits to Run, after the final picture Save when Prompted. you can then load this Clear data (Marked in red on your continue screen) and continue filling out ...
If you dig into the ROM's code, you'll find some hidden credits at 0xFBB. They're for Chris Capenery, who did the graphics. There's also a credit UA Ltd, and copyright notice for both.