Note that there is a timeframe (I think it's
15 5 minutes) within which all edits made are rolled into a single edit. Thus if you make a change, then revert it a minute later, the two edits will be rolled into one and the original change will not be visible in the edit history at all.
Aside from that, if it's non-crucial, I suppose it wouldn't hurt anything. There have been puzzles in the past that have relied on the edit history. I personally don't think it's a great way of doing a puzzle, but I don't think there are any strictures specifically preventing it.
There are avenues to take in extreme circumstances to delete particular revisions of a question/answer, but that's generally reserved for when the information within them could potentially be harmful to someone. If it's simply a worry about revealing too much information for your puzzle, I would suggest deleting the question and reposting it (provided it doesn't already have answers). Otherwise, I'm afraid you'll probably just have to live with it.