The manual's chapters on game design have been split into a separate manual. Maze generation now guarantees a completely connected maze. Image colors are now handled as 1x1 tiles. Games may now include a per-cell control layer that is like the people layer, but is for temporary control that reverts if people revolt. Predefined sides may specify preferred units, and predefined units may specify preferred sides.
Innumerable bug fixes.
Standing orders are now available, and are more general than those in 5.x. View coverage changes are now calculated and displayed incrementally. New players may be added to a game while it is in progress. Nearly all of the defined commands have been implemented for each interface. Scores are now recorded and read back from a scorefile.