 Although "Ancient Domains of Mystery" classic version is available free of charge, in difference to most roguelikes its source code is unavailable.Despite earlier announcing that the source code would be published after the release of version 1.0, Biskup later chose to reserve it for himself in order to retain some mystery about game operation and to curtail the spread of unsanctioned variants.Despite this stance, he is open to licensing the source to capable developers to form a commercial venture.