Next stages are repeat and from stage 93 four stages repeat only.
So, there's 3 full rounds of 32 boards that repeat, and then it changes to only repeating the last 4 boards over and over. That's an interesting repeat pattern.
A somewhat unrelated question: is anyone else having difficulty with the save state function in the recent versions of MAME? I've tried to save state on a few different games in WolfMAME 101 and they don't seem to work reliably any more. I had very few problems with older versions like 0.78, and even as late as 0.94 or so, but somewhere along the line it seems to have been broken.