In the first installment of the Raidy series, the dungeon maps appear to be blank. This is not a bug, but a feature.
Raidy 1 was designed that way. The developer wanted the user to map out the dungeon on their own, like a real adventurer. They provided the basic map shape, but with no details. Based on more modern gaming conventions this is either annoying or fun, depending on what type of player you are.