Rain Feather:
...Choose Your Own Adventure...
You ever play "Hyperspace"?
That... Was...
Weird! Hehe.
Yeah, Creature of Havoc was ok once you figured out how to decode the language thing, and get into the habit of shifting page references at the right times.
It had a lot of dead-end paths though, but it wasn't like: "You made the wrong choice, you're dead! Your life and quest end here!"
It often just continued normally, as if you'd made the right choice, and even offered you more choices. Lulling you into a false sense of security. Except that, from that point on, EVERY choice you'd pick would eventually lead to your horrible death! hehe.
And that bit in the final area was just evil. You wander into the wrong room, and the door locks behind you. Also you have to fight an enemy in there. You win the fight, no problem, you think.
So you might explore the room, looking for shinies... Then the enemy you just killed regenerates and jumps you. So you fight it again! You win again, and think, ok, that was weird, I'd better get out of here. So you examine the door that locked behind you. Before you can figure out how to open it, the enemy gets up and attacks you again!
Yep, you're basically looped into fighting this thing again and again and again for eternity, or until you die, or just give up, hehe.
But yeah, it was certainly an interesting challenge, very different from the usual "go through a dungeon, kill stuff, get shiny things, ???, profit!" of other Fighting Fantasy books.