[panzagl]

Simpler than AD&D, not implying that they're simple. What you described is a big kriegsspiel- the equivalent of Gygax and Kuntz running multiple parties through the Greyhawk dungeon at the same time. They would have used similar methods to limit information being shared between parties.

Or for a more measurable metric, the von Reisswitz rules are 76 pages, which iirc was about the size of the player's handbook:

https://toofatlardies.co.uk/product/kriegsspiel-1824/

Edit- Oops, just reread what I originally wrote and I said 'much' simpler, which would be stretching things.