Some games used the manual as DRM,
I remember hating that as a kid, because I could never remember what was in the manual, so I'd spend hours trying to solve a puzzle that had an answer key already provided - if only I had remembered that the "minotaur's ciper" was just printed in the manual. I would always just assume that I had missed something in-game and keep looking, especially because so few games explicitly told you to go check the booklet.
The game being explicit to "check the manual and do X" would honestly have been preferable, but the games I was into always seemed to have like "pirate symbol translation guide" or similar, that could easily be dismissed as fun flavour inclusions and not the answer key to in-game puzzles.
At one point in time my dad threw away the box & manual for some game we'd bought, only to have to go borrow the booklet from a friend and photocopy the necessary pages, so that we could complete the game. Nowadays, watching Mostly Walking hit those games and one of the lads needs to find a sketchy .pdf of the manual for them to progress has been such a cathartic nostalgia trip.
That one winds up being such a wild story, too.
That Ambrosia went from The Darling Star of Mac software and gaming, into near total obscuring and quiet collapse, is just ... bizarre. The choice to pivot to "serious, adult" tool software from gaming, where they had this loyal and devoted following and could have continued collecting cheques if they'd just made an agreement with a platform ... over to a marketplace that was already saturated, no one knew them, and most of their tools were significantly more expensive than competitors with only minor polish and UI advantages to justify the price was one of the most openly self-sabotaging choices I've ever seen a company make.
That Andrew Welch just vanished afterwards is probably even more confusing. Trying to find out where he ended up or what he's doing now ... no dice. He's occasionally surfaced for retro interviews about their old games, but it doesn't seem like he's still active or visible anywhere; huge change from a guy who was loudly That Mac Snob for years and was a constant presence on early internet BBS and forums.
Matt Burch doing nearly the same thing just compounds the impression. He is doing computer engineering stuff, walked away from games work entirely after EV Nova and says he "never" intends to return to the EV series or games dev in general. It's seemed like he's super emphatic across a few interviews that it was rewarding at the time but it is absolutely under no circumstances something he'd return to, no matter what fans say or what other inspirations strike.
Have to wonder if the internal collapse of Ambrosia was so horrid that everyone in leadership burned out completely and just wants to put that entire chapter into the rearview.