Now Rachel had taken the household idols and put them in the camel’s saddle, and she sat on them. And Laban felt through all the tent but did not find them.
And she said to her father, “Let it not displease my lord that I cannot rise before you, for the manner of women is with me.” And he searched but did not find the household idols.
Genesis 31:34-35
The Biblical defense is clearly that she was menstruating when she hid the Bibles.
Nethack, Elite, Captive, Elder Scrolls, Magic Carpet, Simcity 2000 (reticulating splines)… oh, and a little game called Minecraft.
Procedural generation is common. The way Dwarf Fortress does it where the rules and game elements change is nearly unique. Pretty much just that and Nethack, AFAIK, which is why Dwarf Fortress stuck with Nethack-style ASCII so long.