Maps that can be played by one person, these are scripted so that you play one side of a conflict and the computer plays the other.
(Usually the player plays the good/light forces, the computer plays the evil/Dark forces).
In Myth II: Soulblighter there are 26 solo maps (levels), 2 of which are secret.
[For descriptions of all the single player / solo maps check out MythIIK or The Training Hall. In Myth: TFL there are 25 solo levels